Fix activate for 1-gear scaled case

Convert activate to use with_gear_rotation

Modify update_proxy_status to use options[:local] instead of checking
OPENSHIFT_GEAR_DNS vs OPENSHIFT_APP_DNS

Modify with_gear_rotation to support specifying target gears as an
array of uuids

Fix sorting of all_deployments_by_activation so deployment dirs with no
activations are sorted in the correct order