mount - fix module_util pathing issue for ansible 2.9

In Ansible 2.9 (pre 2.10 routing), the AnsiballZ creation of the payload
will add an extra directory to the module_util path because ismount.py
shares the same name as it's parent dir which creates an inconsistency
in the payload creation. This causes the Collection module
ansible.posix.mount to work in Ansible 2.10 but not 2.9, with this pull
request a simple renaming of the module_util which side steps this
inconsistency.

Fixes https://github.com/ansible-collections/ansible.posix/issues/21

Signed-off-by: Adam Miller <admiller@redhat.com>

changelogs/fragments/21-mount-module_util-routing-issue.yml

@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - mount - fix issues with ismount module_util pathing for Ansible 2.9 (fixes https://github.com/ansible-collections/ansible.posix/issues/21)

plugins/modules/mount.py

@@ -176,7 +176,7 @@ import os
 import platform
 
 from ansible.module_utils.basic import AnsibleModule
-from ansible_collections.ansible.posix.plugins.module_utils.ismount import ismount
+from ansible_collections.ansible.posix.plugins.module_utils.mount import ismount
 from ansible.module_utils.six import iteritems
 from ansible.module_utils._text import to_bytes, to_native