Adding tests in the bgp_evpn_rt5 topology to cover the changed
bgp -> zebra interaction that does no longer rely on withdrawing and
then re-installing the route. The newly introduced pathCount of EVPN
next-hops is checked. In addition the log is checked for MAC_DELETE or
NEIGH_DELETE during multipath flaps that must no longer be present for
the test to succeed.
Signed-off-by: Christopher Dziomba <christopher.dziomba@telekom.de>