R1:b441e8b81e31

Allow Drydock blueprints to be disabled

Summary: Ref T9252. If you have a blueprint and you do not like that blueprint very much, you can disable it.

Test Plan: Disabled / enabled some blueprints.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9252

Differential Revision: https://secure.phabricator.com/D14156