Added support for openSUSE MicroOS (#5998)

* fix(zypper): Added condition to check for transactional-update binary to support microos

closes #5615

* style(changelog): Made zypper-change uppercase

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

* fix(zypper): Removed check for /var/lib/misc/transactional-update.state

* feat(zypper): Aligned transactional-update checks with zypper's

* refactor(zypper): Removed dependency to psutil and made use of parsing /proc/mount

* refactor(zypper): Removed need for regex, plus small refactoring

---------

Co-authored-by: André Dörscheln <ad@itesign.de>
Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 2c762c4)

changelogs/fragments/5615-zypper-transactional-update.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "zypper - make package managing work on readonly filesystem of openSUSE MicroOS (https://github.com/ansible-collections/community.general/pull/5615)."

plugins/modules/zypper.py

@@ -519,8 +519,21 @@ def repo_refresh(m):
     return retvals
 
 
+def get_fs_type_and_readonly_state(mount_point):
+    with open('/proc/mounts', 'r') as file:
+        for line in file.readlines():
+            fields = line.split()
+            path = fields[1]
+            if path == mount_point:
+                fs = fields[2]
+                opts = fields[3]
+                return fs, 'ro' in opts.split(',')
+    return None
+
+
 def transactional_updates():
-    return os.path.exists('/var/lib/misc/transactional-update.state')
+    return os.path.exists('/usr/sbin/transactional-update') and get_fs_type_and_readonly_state('/') == ('btrfs', True)
+
 
 # ===========================================
 # Main control flow