[py] Python bindings to parcel cancel and progress APIs
[py] Python bindings to parcel cancel and progress APIs

Adds the ability to cancel a parcel distribution and/or download.
Progress information is now visible in the parcel object.

cloudera/cm_api,justinhayes/cm_api,cloudera/cm_api,cloudera/cm_api,justinhayes/cm_api,justinhayes/cm_api,cdapio/cm_api,cdapio/cm_api,cdapio/cm_api,cdapio/cm_api