Fix "gatewaty" typo in /etc/network/interfaces

The example /etc/network/interfaces file from the page at <http://docs.openstack.org/trunk/openstack-compute/install/apt/content/osfolubuntu-prerquisite.html> has a trivial typo in it that says "gatewaty10.211.55.1" when it should say "gateway 10.211.55.1".

Change-Id: I471a30fce99e6051f862f648150089cf4058fd0f
Update references of "folsom" to "grizzly"

The instructions as provided in the page at <http://docs.openstack.org/trunk/openstack-compute/install/apt/content/osfolubuntu-prerquisite.html> should pretty much work the same for grizzly as they do for folsom, assuming that you change the specific names of the repositories that you're using to suit.

Change-Id: I22aca91c0a9aa396117709c347f106aede387013
Merge "Fix "gatewaty" typo in /etc/network/interfaces"
Merge "Update references of "folsom" to "grizzly""