Added separate log level for Rally debugging

  Default DEBUG log level produces a lot of output from off-site
  components, like OpenStack clients etc.
  This patch implements addition log level 'RALLYDEBUG' and cli/config
  options.

Change-Id: I58f29c5c69e23de297404a33e4e416e6844de4a3
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