Remove lock from _connect

[juli4nb4dillo]

• Lock on _connect seems to be redundant, since _request already awaits the connectTask.
• Bubble up TimeOut and Connection exceptions as different exceptions, so they can dealt with the container separately (ignore, or remake a connection).

[alexrudd2]

I think it should be fine to remove the lock, but since it's not causing any problems, I want to iron out the disconnect issue first before making another change. Therefore, moving this to draft.

[alexrudd2]

I've split out removing the lock into #80, in order to land it separately.

The debugging/exception stuff belongs in #75