[service:start/stop] Fix the stopping and starting of accounts.

Summary: There was a bug in how we were determining the set of accounts to start/stop. As a consequence starting and stopping of accounts wasn't really working. I believe the logic is fixed now.

Test Plan: Look at the code to make sure that it makes sense.

Reviewers: emfree

Subscribers: spang
[monocle/percent] Show the progress of a sync.