Sync latest strutils from oslo-incubator for mask_password fix

This sync pulls in:
   1131b56 Enable mask_password to handle byte code strings

This is the only update since the last sync:
   beca4db Sync latest strutils from oslo-incubator

This is needed to fix a delete volume failure when processutils
calls mask_password with a byte code string.

Change-Id: Ie8a8c8e26abc0e387830bc9246e9a44913ae9b24
Closes-bug: #1368527
(cherry picked from commit cb5bcca025f9a34ecb9bc72b8fe570e6a63e442d)
Merge "Sync latest strutils from oslo-incubator for mask_password fix" into stable/icehouse