v2.12: C Implementation of Archive Push

IMPORTANT NOTE: The new TLS/SSL implementation forbids dots in S3 bucket names per RFC-2818. This security fix is required for compliant hostname verification.

Bug Fixes:

* Fix issues when a path option is / terminated. (Reported by Marc Cousin.)
* Fix issues when log-level-file=off is set for the archive-get command. (Reported by Brad Nicholson.)
* Fix C code to recognize host:port option format like Perl does. (Reported by Kyle Nevins.)
* Fix issues with remote/local command logging options.

Improvements:

* The archive-push command is implemented entirely in C.
* Increase process-max limit to 999. (Suggested by Rakshitha-BR.)
* Improve error message when an S3 bucket name contains dots.

Documentation Improvements:

* Clarify that S3-compatible object stores are supported. (Suggested by Magnus Hagander.)

doc/xml/user-guide.xml

@@ -1959,7 +1959,7 @@
         <title>S3-Compatible Object Store Support</title>
 
         <execute-list host="{[host-pg1]}">
-            <title>Install packages required for S3-Compatible object store support</title>
+            <title>Install packages required for S3-compatible object store support</title>
 
             <execute if="{[os-type-is-debian]}" user="root" pre="y">
                 <exe-cmd>apt-get install libio-socket-ssl-perl libxml-libxml-perl</exe-cmd>
@@ -2957,7 +2957,7 @@
 
                 <execute user="postgres" output="y">
                     <exe-cmd>cat /var/log/pgbackrest/demo-archive-push-async.log</exe-cmd>
-                    <exe-highlight> WAL file\(s\) to archive|pushed WAL file 0000000</exe-highlight>
+                    <exe-highlight> WAL file\(s\) to archive|pushed WAL file \'0000000</exe-highlight>
                 </execute>
             </execute-list>
         </section>