Changed dropdown menu to align right on driver details page

When selecting an image on the driver details page of 'enroll node'
the dropdown menu was aligned to the left of the button meaning that
a lot of the menu and it's content was cut off. I have re-aligned
this menu to the right so that the full dropdown is viewable and not
cut off at the edge of the modal.

Change-Id: Icff5eab3d0cae82bc8d69103bd7ee0a46476c7c9

ironic_ui/static/dashboard/admin/ironic/enroll-node/enroll-node.html

@@ -217,7 +217,7 @@
                         translate>
                   Choose an Image
                 </button>
-                <ul class="dropdown-menu">
+                <ul class="dropdown-menu dropdown-menu-right">
                   <li>
                     <a class="dropdown-item"
                        ng-repeat="imageObj in ctrl.images"