Remove double spaces from comments and documentation.

Double spaces have fallen out of favor in recent years because they no longer contribute to readability.

We have been using single spaces and editing related paragraphs for some time, but now it seems best to update the remaining instances to avoid churn in unrelated commits and to make it clearer what spacing contributors should use.

test/lib/pgBackRestTest/Common/BuildTest.pm

@@ -25,7 +25,7 @@ use constant BUILD_AUTO_H                                           => 'build.au
     push @EXPORT, qw(BUILD_AUTO_H);
 
 ####################################################################################################################################
-# Save contents to a file if the file is missing or the contents are different.  This saves write IO and prevents the timestamp from
+# Save contents to a file if the file is missing or the contents are different. This saves write IO and prevents the timestamp from
 # changing.
 ####################################################################################################################################
 sub buildPutDiffers

test/lib/pgBackRestTest/Common/CoverageTest.pm

@@ -457,8 +457,8 @@ sub coverageGenerate
                     $strFile = substr($strLine, 3);
                     $rhCoverage->{$strFile} = undef;
 
-                    # Generate a random anchor so new reports will not show links as already followed.  This is also an easy way
-                    # to create valid, disambiguos links.
+                    # Generate a random anchor so new reports will not show links as already followed. This is also an easy way to
+                    # create valid, disambiguos links.
                     $rhCoverage->{$strFile}{anchor} = sha1_hex(rand(16));
                 }
                 # Mark functions as initially covered

test/lib/pgBackRestTest/Common/Io/Buffered.pm

@@ -100,7 +100,7 @@ sub read
         $iRemainingSize -= $iReadSize;
     }
 
-    # If this is a blocking read then loop until all bytes have been read, else error.  If not blocking read until the request size
+    # If this is a blocking read then loop until all bytes have been read, else error. If not blocking read until the request size
     # has been met or EOF.
     my $fTimeStart = gettimeofday();
     my $fRemaining = $self->timeout();
@@ -264,7 +264,7 @@ sub handleReadSet
     $self->{oReadSelect} = IO::Select->new();
     $self->{oReadSelect}->add($self->handleRead());
 
-    # Check if the read handle has a pending method.  This should be checked before can_read for SSL sockets.
+    # Check if the read handle has a pending method. This should be checked before can_read for SSL sockets.
     $self->{bPending} = defined($fhRead) && $fhRead->can('pending') ? true : false;
 }
 

test/lib/pgBackRestTest/Common/ListTest.pm

@@ -113,7 +113,7 @@ sub testListGet
                         # Skip this test if it is performance and no performance is specified
                         next if ($bNoPerformance && $hTest->{&TESTDEF_TYPE} eq TESTDEF_PERFORMANCE);
 
-                        # Skip this test if it is not C and vm=none.  Perl tests require Docker which is not supported.
+                        # Skip this test if it is not C and vm=none. Perl tests require Docker which is not supported.
                         next if ($strVm eq VM_NONE && !$hTest->{&TESTDEF_C});
 
                         # Skip this test if a container is required and vm=none.
@@ -128,7 +128,7 @@ sub testListGet
                                 ($strDbVersion ne 'all' &&
                                     $strDbVersion eq ${$$oyVm{$strTestOS}{&VM_DB_TEST}}[$iDbVersionIdx]))
                             {
-                                # Individual tests will be each be run in a separate container.  This is the default.
+                                # Individual tests will be each be run in a separate container. This is the default.
                                 my $bTestIndividual =
                                     !defined($hTest->{&TESTDEF_INDIVIDUAL}) || $hTest->{&TESTDEF_INDIVIDUAL} ? true : false;
 

test/lib/pgBackRestTest/Common/RunTest.pm

@@ -35,8 +35,8 @@ use constant BOGUS =>                                               'bogus';
     push @EXPORT, qw(BOGUS);
 
 ####################################################################################################################################
-# The current test run that is executing.  Only a single run should ever occur in a process to prevent various cleanup issues from
-# affecting the next run.  Of course multiple subtests can be executed in a single run.
+# The current test run that is executing. Only a single run should ever occur in a process to prevent various cleanup issues from
+# affecting the next run. Of course multiple subtests can be executed in a single run.
 ####################################################################################################################################
 my $oTestRun;
 my $oStorage;

test/lib/pgBackRestTest/Common/StoragePosix.pm

@@ -697,7 +697,7 @@ sub owner
         my $iUserId;
         my $iGroupId;
 
-        # If the user or group is not defined then get it by stat'ing the file.  This is because the chown function requires that
+        # If the user or group is not defined then get it by stat'ing the file. This is because the chown function requires that
         # both user and group be set.
         my $oStat = $self->info($strFilePath);
 

test/lib/pgBackRestTest/Common/VmTest.pm

@@ -344,7 +344,7 @@ sub vmValid
 push @EXPORT, qw(vmValid);
 
 ####################################################################################################################################
-# Which vm to use for the test matrix.  If one of the standard four, then use that, else use VM4.
+# Which vm to use for the test matrix. If one of the standard four, then use that, else use VM4.
 ####################################################################################################################################
 sub vmTest
 {