Bug 15864 - SMS cellular providers link missing from administration sidebar menu

 Bug 15864 - SMS cellular providers link missing from administration sidebar menu

When the SMSSendDriver system preference is set to "Email" a link to the
SMS cellular providers management page should appear in the left-hand
sidebar menu on Administration pages. This patch adds the link to
admin-menu.inc.

To test, apply the patch set your SMSSendDriver system preference to
"Email." View various Administration pages which show the left-hand
sidebar menu and confirm that "SMS cellular providers" is in the list.

Empty the SMSSendDriver preference and confirm that the link no longer
appears.

Signed-off-by: Nicole C Engard <nengard@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>