added ability for bin/quiesce-*.sh to take env vars as args

related:
  https://github.com/zenoss/serviced/pull/548
  https://github.com/zenoss/platform-build/pull/141
  https://github.com/zenoss/platform-build/pull/142
  https://github.com/zenoss/zenoss-prodbin/pull/180
  https://github.com/zenoss/zenoss-prodbin/pull/181