webadmin: Rewrote arranging of NICs in Host/Networks subtab

This patch includes:
* Some needed refactoring.
* Sorting of NICs by name using LexoNumericComparator.
* Removal of HostVLanByNameComparer class which is no longer used.
* Improvement of computational complexity - old code was naive and would
  perform in O(n^2), reduced to O(nlogn) bounded by sorting.

Change-Id: I0b464cc023282ceab868230a1c31638ebe75de4d
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=883269
Signed-off-by: Lior Vernia <lvernia@redhat.com>