Added missing versionadded for show_full_context()
Raise a 401 reponse instead of redirecting to the login page

Also fixed bad tests that should have caught this.

Fixes saltstack/salt-api#155.
Allow dot-lookup of Salt functions in Jinja templates
Merge pull request #13804 from whiteinge/show-full-context-versionadded

Added missing versionadded for show_full_context()
Merge pull request #13805 from whiteinge/jinja-dot-lookup-salt-funs

Allow dot-lookup of Salt functions in Jinja templates
Merge pull request #13806 from whiteinge/rest_cherrypy-401-fix

Raise a 401 reponse instead of redirecting to the login page