Check for any monkeypatching

Checking oinly for monkeypatching of the ``os`` module is
insufficient.  A process might have chosen not to patch ``os`` but
still needs to use the eventlet version of Popen to deal with proper
forks.  This version checks if any modules have been monkeypatched
with the eventlet versions.

Closes-Bug: #1277231

Change-Id: Ia8d7150e9e7ced58132e8e90e7ad68fb3c7c3b9f
Merge "Check for any monkeypatching"