Modify rally commands deployment, task, and verify

Small modifications to the rally commands 'deployment', 'task', and
'verify'.
In deployment, rename the subcommand endpoint to show, and remove
the pprint and json output options in subcommand config in favor of
pretty-printed json output only.
In task, perform the same in subcommand results as in config.
In verify, perform the same in subcommand results as in config.

Change-Id: I9686abf5088782e68111638da10be72c0e1135fa
add ability to refer deployment by uuid or name

  also deployment name turned unique in db

Change-Id: I513b5259e0cfa66780b4ce00cf78dc57aeeb57db
add 'rally task list' filters

  Add ability to filter tasks by status and/or deployment.

Change-Id: I663bddf73a4d5be1b24e712ddcde9efdf494f005