Change ping wait flag
Change ping wait flag

This is an optimization of the ping command. It changes ping test
from waiting for a single sent packet for 300 seconds to waiting
to receive a packet from any number of sent packets. The current
implemenation waits for full 300 seconds before retrying if we
do not get a reply for the first packet sent. By using -w flag,
we keep sending icmp packets until a reply is sent, making the
ping test more responsive to connectivity change.

Change-Id: I01ab374ae44718c8d56e2d7f35812dfb5bb2ce5a
Signed-off-by: Feng Pan <10d7d91a403737f0faecf20d08873f2a73403172@redhat.com>

openstack/tripleo-heat-templates,trozet/opnfv-tht,trozet/opnfv-tht,trozet/opnfv-tht,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates