adb: Add a few more wait-for commands

 * wait-for-recovery is obvious.
 * wait-for-online will wait for recovery || device

Change-Id: I70f747bcd201a4157b988d7ed49bcc8e5ff4c85f
Inline with kernel.

Change-Id: Idd0499eb28e814d32228131eccbb4a5d4795e0e2
Signed-off-by: Derek Cannata <thederekjay@gmail.com>