Adding new "pingable" node ready strategy and test

Change-Id: I0829c59956209c734d7d3cdd4a46602be055622f
Reviewed-on: https://q.tasktop.com/alm/s/c2c-oss/gerrit/124
Tested-by: Hudson
Reviewed-by: Myles Feichtinger <myles.feichtinger@tasktop.com>
Reviewed-by: Michael Nelson <michael.nelson@tasktop.com>