debian: do not enable 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
(cherry picked from commit 5420992a2cad4c0a23e436f5f416011f46c97ecd)
Merge "debian: do not enable grizzly repository from gplhost" into stable/icehouse