v2.19: C Migrations and Bug Fixes

Bug Fixes:

* Fix remote timeout in delta restore. When performing a delta restore on a largely unchanged cluster the remote could timeout if no files were fetched from the repository within protocol-timeout. Add keep-alives to prevent remote timeout. (Reported by James Sewell, Jens Wilke.)
* Fix handling of repeated HTTP headers. When HTTP headers are repeated they should be considered equivalent to a single comma-separated header rather than generating an error, which was the prior behavior. (Reported by donicrosby.)

Improvements:

* JSON output from the info command is no longer pretty-printed. Monitoring systems can more easily ingest the JSON without linefeeds. External tools such as jq can be used to pretty-print if desired. (Contributed by Cynthia Shang.)
* The check command is implemented entirely in C. (Contributed by Cynthia Shang.)

Documentation Improvements:

* Document how to contribute to pgBackRest. (Contributed by Cynthia Shang.)
* Document maximum version for auto-stop option. (Contributed by Brad Nicholson.)

Test Suite Improvements:

* Fix container test path being used when --vm=none. (Suggested by Stephen Frost.)
* Fix mismatched timezone in expect test. (Suggested by Stephen Frost.)
* Don't autogenerate embedded libc code by default. (Suggested by Stephen Frost.)

test/code-count/file-type.yaml

@@ -123,6 +123,10 @@ doc/xml/coding.xml:
   class: doc/source
   type: xml
 
+doc/xml/contributing.xml:
+  class: doc/source
+  type: xml
+
 doc/xml/documentation.xml:
   class: doc/source
   type: xml
@@ -195,10 +199,6 @@ lib/pgBackRest/Backup/Info.pm:
   class: core
   type: perl
 
-lib/pgBackRest/Check/Check.pm:
-  class: core
-  type: perl
-
 lib/pgBackRest/Common/Cipher.pm:
   class: core
   type: perl
@@ -331,14 +331,6 @@ lib/pgBackRest/Protocol/Storage/Remote.pm:
   class: core
   type: perl
 
-lib/pgBackRest/Restore.pm:
-  class: core
-  type: perl
-
-lib/pgBackRest/RestoreFile.pm:
-  class: core
-  type: perl
-
 lib/pgBackRest/Storage/Base.pm:
   class: core
   type: perl
@@ -651,6 +643,14 @@ src/command/restore/protocol.h:
   class: core
   type: c/h
 
+src/command/restore/restore.c:
+  class: core
+  type: c
+
+src/command/restore/restore.h:
+  class: core
+  type: c/h
+
 src/command/stanza/common.c:
   class: core
   type: c
@@ -1119,6 +1119,14 @@ src/common/type/xml.h:
   class: core
   type: c/h
 
+src/common/user.c:
+  class: core
+  type: c
+
+src/common/user.h:
+  class: core
+  type: c/h
+
 src/common/wait.c:
   class: core
   type: c
@@ -1259,6 +1267,10 @@ src/info/infoPg.h:
   class: core
   type: c/h
 
+src/info/manifest.c:
+  class: core
+  type: c
+
 src/info/manifest.h:
   class: core
   type: c/h
@@ -1351,6 +1363,10 @@ src/postgres/interface/v110.c:
   class: core
   type: c
 
+src/postgres/interface/v120.c:
+  class: core
+  type: c
+
 src/postgres/interface/version.auto.h:
   class: core/auto
   type: c/h
@@ -1763,7 +1779,7 @@ test/lib/pgBackRestTest/Module/Mock/MockStanzaTest.pm:
   class: test/module
   type: perl
 
-test/lib/pgBackRestTest/Module/Performance/PerformanceArchiveTest.pm:
+test/lib/pgBackRestTest/Module/Performance/PerformanceArchivePerlTest.pm:
   class: test/module
   type: perl
 
@@ -1827,6 +1843,14 @@ test/src/common/harnessPq.h:
   class: test/harness
   type: c/h
 
+test/src/common/harnessStorage.c:
+  class: test/harness
+  type: c
+
+test/src/common/harnessStorage.h:
+  class: test/harness
+  type: c/h
+
 test/src/common/harnessTest.c:
   class: test/harness
   type: c
@@ -1835,6 +1859,10 @@ test/src/common/harnessTest.h:
   class: test/harness
   type: c/h
 
+test/src/common/harnessTest.intern.h:
+  class: test/harness
+  type: c/h
+
 test/src/common/harnessTls.c:
   class: test/harness
   type: c
@@ -2035,6 +2063,10 @@ test/src/module/common/typecTest.c:
   class: test/module
   type: c
 
+test/src/module/common/userTest.c:
+  class: test/module
+  type: c
+
 test/src/module/common/waitTest.c:
   class: test/module
   type: c
@@ -2083,6 +2115,14 @@ test/src/module/info/infoTest.c:
   class: test/module
   type: c
 
+test/src/module/info/manifestTest.c:
+  class: test/module
+  type: c
+
+test/src/module/performance/typeTest.c:
+  class: test/module
+  type: c
+
 test/src/module/perl/configTest.c:
   class: test/module
   type: c