Remove assertTrue from ssh unit tests

These unit tests failed on gerrit review 98819 with the extremely
obvious: AssertionError: False is not true.

Instead actually use the Less/Greater assertions so we even know
what the values are on either side of the equation. Also add an
extra second of buffer to the timeouts, because we have no real
time guaruntees here, and a busy system might totally not get around
to this for an extra second (especially as we are doing int level
compares).

Closes-Bug: #1332512

Change-Id: I60b9f1cf38475faa4cddd9e69fcad575f0d4f1f3
Merge "Remove assertTrue from ssh unit tests"