Remove sqlalchemy-migrate for Glance

Remove remaining references to sqlalchemy-migrate in favour of alembic, which has been used since Ocata.

Validation of input parameters through JSON Schema for OpenStack Shared File Systems Service (Manila)

Nova, Cinder and Keystone have used JSON Schema to validate input parameters in start of operation itself instead of going ahead and reported error after error occurs. We should follow same in Manila. Nova JSON Schema Validation：: ## Validation: def validate(self, *args, **kwargs): try: se...

Move nova-* commands to cliff for OpenStack Compute (nova)

The custom CLI library nova uses for nova-manage and other tools doesn't do enough for us. Let's build upon the shoulders of giants and use an existing, well-maintained CLI library to minimize the maintenance overhead of these tools.