move per-platform apache sites dir conf to attributes

Change-Id: I3b584ec9d90c82e65dee6d989f593ca821dd0800
Using ~> versioning

Since we should be performing semver across our cookbooks, we should
lock to the patch version.  It means "equal to or greater than in the
last digit", so e.g. "~> 2.3" means "equal to 2.3 or greater than 2.3,
but less than 3.0", while "~> 2.3.0" would mean "equal to 2.3.0 or greater
than 2.3.0, but less than 2.4.0".
  http://stackoverflow.com/questions/5170547/what-does-tilde-greater-than-mean-in-ruby-gem-dependencies

Change-Id: Ifa0c45fa86860cc087ccc82b2a13f51f65ba1ea4
Merge "move per-platform apache sites dir conf to attributes"
Update the ubuntu static path for dashboard

With Grizzly the default static path for the Django front-end has
moved from /usr/share/pyshared to /usr/share/openstack-dashboard. This
change moves this forward to support Grizzly's default paths on Ubuntu.

Change-Id: I036191e2811e3ba4dc36114e5af748e8427f0ea6