Ping retry
Ping retry

The single ping method in the validation script is causing for
deployments to fail. When reviewing the network connectivity, we are
finding we actually do have connectivity
( https://gist.github.com/jtaleric/0276a117625e44993be0 ). This patch is
to change the ping count from 1 to 10, to ensure the network is up.

Closes-Bug: 1563521
Change-Id: I9772407554dffa91978a49a16490ef9ed448a054

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