webadmin: Change 'Required actions:' to 'Devices to configure:'

Changed text in webadmin's VM Guide Me dialog to reflect more common use case

Change-Id: I2115b1dddbbd3f02b93a521634950e6bc3a690c3
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=912646
Signed-off-by: Martin Betak <mbetak@redhat.com>