Max failure percent not longer needed for Rally gate
Max failure percent not longer needed for Rally gate

This patch removes max_failure_percent attribute from
the rally zaqar-zaqar.yaml.

Change-Id: I550a2f7e4899415f267b313874abca7e704a5663

openstack/zaqar,openstack/zaqar,openstack/zaqar,openstack/zaqar