Update lcov settings.

Mark any coverage less that 100% as yellow, less that 90% as red.

Add comments to config file and make genhtml use it as well as lcov.

test/src/lcov.conf

@@ -1,3 +1,17 @@
+# LCOV Settings
+
+# Specify if branch coverage data should be collected and processed
 lcov_branch_coverage=1
+
+# Specify  the  regular expression of lines to exclude from branch coverage
 lcov_excl_br_line=[A-Z_]+\(|assert\(|testBegin\(
+
+# Specify the regular expression of lines to exclude
 lcov_excl_line=\{\+*uncovered|\{\+*uncoverable
+
+# Coverage rate limits
+genhtml_hi_limit = 100
+genhtml_med_limit = 90
+
+# Width of line coverage field in source code view
+genhtml_line_field_width = 9

test/test.pl

@@ -1177,8 +1177,8 @@ eval
                 if ($oStorageBackRest->exists($strLCovFile))
                 {
                     executeTest(
-                        "genhtml ${strLCovFile} --branch-coverage --show-details --output-directory" .
-                            " ${strBackRestBase}/test/coverage/c");
+                        "genhtml ${strLCovFile} --config-file=${strBackRestBase}/test/src/lcov.conf" .
+                            " --output-directory=${strBackRestBase}/test/coverage/c");
 
                     foreach my $strCodeModule (sort(keys(%{$hCoverageActual})))
                     {