Added execution cache for document generation.

Added an execution cache so that documentation can be generated without setting up the full container environment. This is useful for packaging, keeps the documentation consistent for a release, and speeds up generation when no changes are made in the execution list.

test/lib/pgBackRestTest/Docker/ContainerTest.pm

@@ -212,12 +212,7 @@ sub containerBuild
 
     # Create temp path
     my $strTempPath = dirname(abs_path($0)) . '/.vagrant/docker';
-
-    if (!-e $strTempPath)
-    {
-        mkdir $strTempPath
-            or confess &log(ERROR, "unable to create ${strTempPath}");
-    }
+    filePathCreate($strTempPath, '0770', true, true);
 
     # Create SSH key (if it does not already exist)
     if (-e "${strTempPath}/id_rsa")