[cinder-csi-plugin] Fix filesystem resize (#1434)
[cinder-csi-plugin] Fix filesystem resize (#1434)

Now we use "findmnt" command to find the device path. Unfortunately,
this command may return multiple entries of the same mount, but in
fact we need just the first one.

To prevent this issue we add "--first-only" flag to the command.
kubernetes/cloud-provider-openstack,kubernetes/cloud-provider-openstack,kubernetes/cloud-provider-openstack