Add a "Reconnect" debugging action and show reconnect delays in the console

Summary: Ref T12568. Ref T12567. Allows you to force a reconnect, and shows the reconnect delay on connection close/failure.

Test Plan:

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12568, T12567

Differential Revision: https://secure.phabricator.com/D17705