[autotest] Revert NOOP RPC check in frontend_wrappers.py

We're temporarily(?) taking out the noop-rpc check in RetryingAFE and
RetryingTKO.  This actually reverts two commits:

  Revert "[autotest] Fix frontend_wrappers_unittest.py flakiness"
  This reverts commit cb5371ab8cbea2f7df6adf8a5f7c04786dcf9ca5.

  Revert "[autotest] RPC retry logic shouldn't retry RPCs that can't succeed"
  This reverts commit 184c40f9ffc95f954ebe355fa4c51461d76fd764.

BUG=chromium-os:29088
TEST=unit, use run_suite.py to schedule a test suite

Change-Id: I74da133a7ecb1b4c7aa98d146afa8d2d65d1a33d
Reviewed-on: https://gerrit.chromium.org/gerrit/19894
Tested-by: Chris Masone <cmasone@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Commit-Ready: Chris Masone <cmasone@chromium.org>
2 files changed