Fix PEP8 E302 errors

Also add remaining skipped checks to HACKING

Change-Id: I0c4333ce29597e0a8a233af17c15bed2b4d0711f
Add basic timing support

Add support for novaclient's --timings option.  Due to the transition
to cliff for all data output a psuedo-command Timings is created
to handle output formatting.

TODO:
* extract format and colums options from previous command so
  we can not hard-code '-f table'

Change-Id: I7f1076b7a250fba6a8b24b2ae9353a7f51b792b2
Merge branch 'cleanups-pep' into dt-test