Add a '-p'/'--profiles' option on release.py to provide additional custom Maven profiles.
Those profiles are always activated by default (unless deactivated by that parameter):
- 'addons,distrib,all-distributions' for all commands
- 'release,-qa' for prepare command (plus 'nightly' if deploy option passed),
- 'release,-qa' for perform command,
- 'qa' for package command.