Remove unused import for print_function

A minor fix to https://review.openstack.org/#/c/69234/ which forgets
to remove the unused 'from __future__ import print_function' after
remove all print function.

Change-Id: Iedc925a66fa4dec209cf34ce28b45f768f7bc81d
Modify ceilometer client cmd line help info

The optional argument "--insufficient-data-action" is described as
"... URL to invoke when state transitions to insufficient_data...",
it was " URL to invoke when state transitions to unkown. "

Closes-Bug: #1260343

Change-Id: I34db56bb22b693e752a971f81d7b8467bfc6c4c5
Merge "Remove unused import for print_function"
Merge "Modify ceilometer client cmd line help info"