Promote L2::Aruba to L3::Aruba

Aruba controllers can act as L3 devices and provide L3 information through the
standard MIBs.  This change makes Aruba devices get recognized as such.
Layer2.pm and Layer3.pm provide roughly the same functionality so there should
be little to no impact for Aruba devices only acting as L2 entities.

ChangeLog

@@ -3,6 +3,8 @@ ChangeLog $Id$
 
 version 2.05 ()
     + Fix broken function call in L2::Aironet
+    + Promote L2::Aruba to L3::Aruba, as Aruba devices can be L3 entities and
+      provide L3 information.
 
 version 2.04 (2011-03-31)
     + Support for older HP switch models moved to new L2::HP4000 class