Share Type Create and Update forms need separate fields for fixed parameters

[Tatiana Ovchinnikova]

Create Share Type and Update Share Type forms have a general text field for all extra specs. However two of extra specs are fixed: 'driver_handles_share_servers' is required and 'snapshot_support' is optional with a default value for share type creating. So it's logical to let user choose a value for 'snapshot_support' in a separate field in Create form. Update form even has no field for 'driver_handles_share_servers', so it would be nice to create two separate fields for both. Also when these two choice fields are added, it makes sense to use boolean values and to remove the redundant validation for "allowed_dhss_values = ('true', 'false')".

[OpenStack Infra (hudson-openstack)]

Change abandoned by Tom Barron (<email address hidden>) on branch: master
Review: https://review.openstack.org/338504
Reason: This one is almost a year now without activity; feel free to restore and resume work on it.

[Goutham Pacha Ravi (gouthamr)]

Removed assignee because this had no update for a long time. If you're interested in continuing this work, please refer to/fix comments in https://review.openstack.org/338504 and take over this bug.

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Victoria Martinez de la Cruz <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/manila-ui/+/338504
Reason: Current code adds the required fields, will check if the related bug report is still valid