manila default share type not working

**Bug Report**

What happened:
manila default share type is configured in manila-share:
[DEFAULT]
default_share_type = default_share_type

manila type-list
+--------------------------------------+--------+------------+------------+--------------------------------------+-------------------------------------------+-------------+
| ID | Name | visibility | is_default | required_extra_specs | optional_extra_specs | Description |
+--------------------------------------+--------+------------+------------+--------------------------------------+-------------------------------------------+-------------+
| c06dc973-3527-4e91-a874-de1b906c9633 | default_share_type | public | - | driver_handles_share_servers : False | share_backend_name : CEPHFS1 | None |
| | | | | | vendor_name : Ceph | |
| | | | | | create_share_from_snapshot_support : True | |
| | | | | | mount_snapshot_support : False | |
| | | | | | storage_protocol : CEPHFS | |
| | | | | | snapshot_support : True | |
| | | | | | revert_to_snapshot_support : False | |
+--------------------------------------+--------+------------+------------+--------------------------------------+-------------------------------------------+-------------+

is_default returns "-"

What you expected to happen:
mainila type-list
+--------------------------------------+--------+------------+------------+--------------------------------------+-------------------------------------------+-------------+
| ID | Name | visibility | is_default | required_extra_specs | optional_extra_specs | Description |
+--------------------------------------+--------+------------+------------+--------------------------------------+-------------------------------------------+-------------+
| c06dc973-3527-4e91-a874-de1b906c9633 | default_share_type | public | YES | driver_handles_share_servers : False | share_backend_name : CEPHFS1 | None |
| | | | | | vendor_name : Ceph | |
| | | | | | create_share_from_snapshot_support : True | |
| | | | | | mount_snapshot_support : False | |
| | | | | | storage_protocol : CEPHFS | |
| | | | | | snapshot_support : True | |
| | | | | | revert_to_snapshot_support : False | |
+--------------------------------------+--------+------------+------------+--------------------------------------+-------------------------------------------+-------------+

How to reproduce it (minimal and precise):

**Environment**:
* Kolla-Ansible version (e.g. `git head or tag or stable branch` or pip package version if using release): from stable/wallaby to master