Add get_selections() and set_selections() for dpkg.

This module will enable to freeze a package at a certain version, with the "hold" state.
Add TODO, amend later... FIXME.
possible fix for https://github.com/saltstack/salt/issues/5567
possible fix for https://github.com/saltstack/salt/issues/5567
Added new single module interface to salt clients
Merge remote-tracking branch 'upstream/develop' into unify-api
Now uses new auth Resolve instead of Load
Merge remote-tracking branch 'upstream/develop' into unify-api
Merge remote-tracking branch 'upstream/develop' into unify-api
Using new runner.master_call
create_token
verify_token methods added
refactored master_call
as already required that key 'fun' be part of load dict
'
updated comments
improve file.recurse performance
strip '/' from the prefix beginning and end to sanatize input, os.path.join quirk
document new prefix flag
Merge remote-tracking branch 'upstream/develop' into unify-api
Merge remote-tracking branch 'upstream/develop' into unify-api
Merge remote-tracking branch 'upstream/develop' into unify-api
Removed unnecessary os_family mappings for pidora
Merge remote-tracking branch 'upstream/develop' into unify-api
Merge remote-tracking branch 'upstream/develop' into unify-api