Various fixes and features implemented during doc development

* Better messaging for expiration.
* Fixed already stopped message.
* retention-archive and retention-archive-type now use retention-full and 'full' when not specified.
* Fixed issue where backup-user was required (should default to backrest).
* ExecuteTest now supports retries.
* Fixed issue where log test was not comparing test logs.
* Fixed issue where test logs would not match for ssh connection errors

.gitignore

@@ -5,4 +5,5 @@ test/test
 test/vm/.vagrant
 test/nytprof.out
 test/nytprof/*
-doc/html/*
+doc/output/*
+test/vm/package/*