Open Stack

Right now the os-*-config projects default to looking for their files in 
/opt/stack, with an override env var provided for other locations.  For 
packaging purposes it would be nice if they defaulted to a more 
FHS-compliant location like /var/lib.  For devtest we could either 
override the env var or simply install the appropriate files to /var/lib.

This was discussed briefly in IRC and everyone seemed to be onboard with 
the change, but Robert wanted to run it by the list before we make any 
changes.  If anyone objects to changing the default, please reply here. 
  I'll take silence as agreement with the move. :-)

Thanks.

-Ben