* An earlier optimization of ansible-doc -l caused failures.
The optimization quickly searches the plugin code for short_description
fields and then uses that in the -l output. The searching was a bit too
naive and ended up pulling out malformed yaml. This caused those
plugins to be omitted from the list of plugins of that type with
a warning that their documentation strings were wrong.
This change makes the documentation parser aware that the documentation
string could have a relative indent for all of its fields which makes it
robust in the face of this particular problem.
* Don't search for space after short_description:
Any whitespace would be valid. In particular newline
