webadmin: Configure Roles "DataCenterAdmin" Description is not fully show

In Configure Roles window the description for
DataCenterAdmin is too long and cut at the end.
The window can not be enlarged so the user can
not access the end of the description.

Change-Id: I43cd143f1c353e788602863a5a94c2406e694456
Bug-Url: https://bugzilla.redhat.com/1070723
Signed-off-by: Ravi Nori <rnori@redhat.com>