Proposing Flavio Percoco as maintainer for strutils.py

I'd like to propose myself as maintainer for strutils. My last
contribution to this module is the safe_encode / safe_decode patch
currently being used by other projects throughout OpenStack.

Change-Id: I0e404e068ba8807ceb242ae5b90dbd26bdac1e22
Merge "Proposing Flavio Percoco as maintainer for strutils.py"