* if --rietveld or --gerrit is given, parse only using appropriate
  parser.
* if url has '$HOST-review' in the beginning, assume it's Gerrit
* if type of codereview is detected based on URL, then print this
  information for the user.
  This also applies to `git cl description` but message is logged instead,
  because in '-d|--display' option git cl is supposed to print only description,
  and some tooling likely relies on this :(

R=jochen@chromium.org
BUG=706406

Change-Id: I21c9355c5334fd71db27618cda11287f75168b59
Reviewed-on: https://chromium-review.googlesource.com/473186
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>