Support mode in named volumes when using podman

Volumes with a mode specifier were causing the container to fail to
start with the error: "Wrong format of volume". ironic-dnsmasq was one
services affected by this issue, but you could also hit this issue when
using the volume customisation variables.

Closes-Bug: #2054834
Change-Id: I848bd2838a17756f1c71b07befe1e3d966f5b6c2

ansible/module_utils/kolla_podman_worker.py

@@ -176,7 +176,11 @@ class PodmanWorker(ContainerWorker):
                 mounts.append(mount_item)
             else:
                 try:
-                    src, dest = item.split(':')
+                    mode = 'rw'
+                    if item.count(':') == 2:
+                        src, dest, mode = item.split(':')
+                    else:
+                        src, dest = item.split(':')
                 except ValueError:
                     self.module.fail_json(
                         msg="Wrong format of volume: {}".format(item),
@@ -191,7 +195,7 @@ class PodmanWorker(ContainerWorker):
                 else:
                     filtered_volumes[src] = dict(
                         bind=dest,
-                        mode='rw'
+                        mode=mode
                     )
 
     def parse_dimensions(self, dimensions):

releasenotes/notes/fixes-podman-named-volume-issues-when-using-mode-36b9862321eb9e68.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes an issue, when using podman, with named volumes that use a mode
+    specifier. See `LP#2054834
+    <https://bugs.launchpad.net/kolla-ansible/+bug/2054834>`_ for more details.