Sync processutils and log from oslo

This change syncs in:

33afb20 Fix broken formatting of processutils.execute log statement
5e3d3a5 Mask passwords included without quotes at the ends of commands
6751b30 Remove extra whitespace

The most important part is '33afb20' which was broken cinder debug logging
on running commands after last oslo sync.

Change-Id: I77e0f943d39bb34ff95bac1e9d63d7450f8c24bf
Merge "Sync processutils and log from oslo"