Fixes some typos in stack.sh

Change-Id: Ia627d1793c6db76590844d51854dce35a87206b7
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
debian: do not enbable grizzly repository from gplhost

There is not reason to enable this additional repository anymore.
All the important packages are either in wheezy or wheezy-backports.

Change-Id: I47af16ba6b507fc929b0d2948c757f4060ba93a5
Merge "debian: do not enbable grizzly repository from gplhost"
Merge commit 'refs/changes/83/86083/2' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch