Update oslo

Update gettext, striutils, timeutils and install_venv_common
from oslo.

Change-Id: Ibd9067e3e2be335ef75f0e4a5e4000d143030ab7
Signed-off-by: Chuck Short <chuck.short@canonical.com>
Update mailmap

Change-Id: Ic3050ae029b367f099346dc99e76e33bd47bdc33
Update mailmap

Change-Id: I0f1f8b65db311fee9303dcf1a68c8057d9d778ab
Merge "Update oslo"
Merge "Update mailmap"
Merge "Update mailmap"