BSD: implement virNetDevBridgeCreate() and virNetDevBridgeDelete()
BSD: implement virNetDevBridgeCreate() and virNetDevBridgeDelete()

Implementation uses SIOCIFCREATE2 and SIOCIFDESTROY ioctls.
Also, drop static virNetDevSetupControl() as we have
public one avialable now.

andreabolognani/libvirt,nertpinx/libvirt,eskultety/libvirt,elmarco/libvirt,jardasgit/libvirt,olafhering/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,agx/libvirt,eskultety/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,eskultety/libvirt,nertpinx/libvirt,datto/libvirt,shugaoye/libvirt,jardasgit/libvirt,libvirt/libvirt,andreabolognani/libvirt,taget/libvirt,shugaoye/libvirt,shugaoye/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,jfehlig/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,rlaager/libvirt,jfehlig/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,agx/libvirt,crobinso/libvirt,elmarco/libvirt,taget/libvirt,cbosdo/libvirt,elmarco/libvirt,VenkatDatta/libvirt,eskultety/libvirt,rlaager/libvirt,zippy2/libvirt,libvirt/libvirt,taget/libvirt,datto/libvirt,zippy2/libvirt,eskultety/libvirt,jardasgit/libvirt,nertpinx/libvirt,rlaager/libvirt,shugaoye/libvirt,olafhering/libvirt,datto/libvirt,taget/libvirt,olafhering/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,rlaager/libvirt,olafhering/libvirt,nertpinx/libvirt,libvirt/libvirt,rlaager/libvirt,agx/libvirt,taget/libvirt,crobinso/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,agx/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,cbosdo/libvirt,crobinso/libvirt,VenkatDatta/libvirt,shugaoye/libvirt,agx/libvirt,fabianfreyer/libvirt,zippy2/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,zippy2/libvirt,datto/libvirt