snap: aware of channel in installed snaps (#6435)

* [WIP] snap: aware of channel in installed snaps

* parse snap list output and assert whether channel matches

* undo test

* fail rightfully when install with different channel does not work

* transparetent refresh

* rollback comment in integration test

* rollback comment in integration test

* add changelog frag

* Update plugins/modules/snap.py

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/module_utils/snap.py

@@ -20,6 +20,7 @@ _state_map = dict(
     absent='remove',
     enabled='enable',
     disabled='disable',
+    refresh='refresh',
 )