Speed up failing InternalClient requests

InternalClient.make_request was sleeping after every attempt,
including the last one. We don't need to sleep after the final
attempt; we can just return failure.

Change-Id: Ieee5f96afb5b39a659d8438a237bfd907405165a
Fixed mispelling in function name - accross to across

Change-Id: I7d9749218d277c9e71e47d903b3126f9f73ffe65
Merge "Fixed mispelling in function name - accross to across"
Merge "Speed up failing InternalClient requests"