When executing command on host over ssh, don't ping it first
When executing command on host over ssh, don't ping it first

This dramatically speeds up several tests. The SSH command will fail
rather than the pinging of the host, but this shouldn't be a problem.

Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

open-power/op-test-framework,open-power/op-test-framework,open-power/op-test-framework