Revert "Build retry loop for screen sessions"

This reverts commit cd0fba6c3803bb79b37f09709378cf120a6824c6.

It appears that this isn't actually making things better, and
possibly increasing failure rates. Revert to go back to the
tried and true model of just sleeping a lot.

Change-Id: Ie630f72d91f16160fa12b3892e5c74378d244cea