webadmin: Nic labels should be sorted

Nic labels should be presented according to LexoNumeric order.

There are two places that should be sorted-
1. Setup Networks- edit nic dialog- the current labels.
2. Host interface subtab- the labels tooltip (on nic or bond).

Note-
Setup Networks->edit nic dialog->suggested labels- are already
sorted. HostSetupNetworksModel.getFreeLabels() takes care of it.

Change-Id: I28fb7750504bffdadd9d92f00565e21c272127ff
Bug-Url: https://bugzilla.redhat.com/1091674
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>