Give test mysql user create and drop perms.

Give the openstackci_test Jenkins slave test user permissions to CREATE
and DROP databases. This allows parallel tests to create as many DB
schemas as necessary to run tests without locking in the tests
themselves.

Change-Id: I0466ac8f318b7dc397fac6c16553e284bdb7d707
Merge "Give test mysql user create and drop perms."