astakos: Use custom CommandError in mngt commands
astakos oa2: Restrict redirect URI length during client registration.
Apply the check in the oauth2-client-add snf-manage command.
Refs: #4804
astakos: Update snf-manage oauth2-client-list command
Remove the name field
docs: Update Changelog, upgrade notes and guides
astakos: Fix oauth2-client-delete command
Delete related authorization codes and tokens before deleting the client
astakos oa2: rename settings and url prefixes
Change setting and url prefixes from `oa2` to`oauth2`
astakos: Minor changes in oa2 app
astakos: Introduce CRUD management commands for oa2 clients