New modules btrfs_subvolume / btrfs_info (#5832)

* Initial implementation for new modules btrfs_subvolume and btrfs_info

* Improve/flesh out documentation. Add ability to target filesystem by uuid, label or device. Update tests to test targeting filesystem by each supported parameter and when only mountpoint.

* Updates for btrfs modules. Add missing copyright notices. Switch options to contains in return documentation. Update btrfs_subvolume to always use closest parent mount.

* Add maintainers for btrfs module(s) and remove unused class member cause lint failure.

* Add changelog fragment. Attempt to only run against the VMs as part of CI.

* Updates per code review. Remove changelog fragment. Switch use of map to list comprehension. Add trailing comma to last item in multi-line dicts. Clean up documentation with complete senstences for descriptions and correct/consistent use of macros.

* Improved error handling in btrfs_subvolume module: add custom exception type, favor exceptions over immediate call to fail_json and add single top level return for failure scenarios. Normalize name and snapshot_source parameters early in module execution and remove unecessary duplicate normalization throughout processing.

* Add azp/posix/3 to aliases per feedback

* Clean up automatic mounting. Prevent automount when check_mode=True. Immediately fail if a mount is identified as required and automount=True. Identify the minimal subset of subvolumes that need to be mounted instead of just finding a single common root.

* Skip btrfs_subvolume integration tests if btrfs-progs isn't successfully installed.

* Bump version_added for btrfs modules to 6.6.0. Ensure consistent trailing punctuation for module descriptions and document check_mode behavior as attribute description rather than a module level note.

* Remove unused imports from btrfs_subvolume module.

* Fix import.

* Docs improvements.

---------

Co-authored-by: Felix Fontein <[email protected]>

.github/BOTMETA.yml

@@ -267,6 +267,8 @@ files:
     maintainers: delineaKrehl tylerezimmerman
   $module_utils/:
     labels: module_utils
+  $module_utils/btrfs.py:
+    maintainers: gnfzdz
   $module_utils/deps.py:
     maintainers: russoz
   $module_utils/gconftool2.py:
@@ -395,6 +397,8 @@ files:
     maintainers: catcombo
   $modules/bower.py:
     maintainers: mwarkentin
+  $modules/btrfs_:
+    maintainers: gnfzdz
   $modules/bundler.py:
     maintainers: thoiberg
   $modules/bzr.py: