webadmin: Clearing float from AddRemoveRowPanel

Adding <div style="clear: both;"/> after AddRemoveRowPanel to make sure
next AddRemoveRowPanel will be in a new line.

Change-Id: I88642c763c46c2fd62ebf95511f3f251b964c376
Related-To: https://bugzilla.redhat.com/1064749
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>