Fix 3PAR drivers to work in multi-backend mode.

The 3PAR drivers weren't updated when the multi backend
patch landed on G3 day.  This patch implements the new config
mechanism to accessing FLAGS, so that it works when an admin
has multiple drivers active.

This fixes
bug 1131346

Change-Id: Icc5475d15bfd0fa14aae12ab8a8370a894e46857
Merge "Fix 3PAR drivers to work in multi-backend mode."