virnetdev: Resolve Coverity DEADCODE
virnetdev: Resolve Coverity DEADCODE

Coverity complains that because the for loop is from 0 to 5 (max tokens)
and the impending switch/case statements used each of the #define values
that the 'default' wouldn't reachable. This patch will convert the #define's
into enum's and add the obligatory dead_error_begin marker for these type
situations.

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

rlaager/libvirt,andreabolognani/libvirt,zippy2/libvirt,eskultety/libvirt,jfehlig/libvirt,taget/libvirt,datto/libvirt,agx/libvirt,libvirt/libvirt,taget/libvirt,olafhering/libvirt,andreabolognani/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,zippy2/libvirt,eskultety/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,jfehlig/libvirt,jfehlig/libvirt,elmarco/libvirt,crobinso/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,jfehlig/libvirt,eskultety/libvirt,datto/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,jardasgit/libvirt,agx/libvirt,elmarco/libvirt,taget/libvirt,zippy2/libvirt,shugaoye/libvirt,nertpinx/libvirt,elmarco/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,libvirt/libvirt,rlaager/libvirt,jardasgit/libvirt,datto/libvirt,taget/libvirt,rlaager/libvirt,datto/libvirt,VenkatDatta/libvirt,crobinso/libvirt,olafhering/libvirt,olafhering/libvirt,elmarco/libvirt,jardasgit/libvirt,nertpinx/libvirt,jardasgit/libvirt,crobinso/libvirt,agx/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,agx/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,zippy2/libvirt,libvirt/libvirt,rlaager/libvirt,crobinso/libvirt,datto/libvirt,elmarco/libvirt,agx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,shugaoye/libvirt,taget/libvirt,andreabolognani/libvirt,rlaager/libvirt