CRAB3 3.3.7.rc4/rc5 versions for HG1407

Includes the following fixes (just mentioning crabserver and ignoring crabclient and crabtaskworker):

* Fix the regexp for the publishname parameter.
* Fix getoutput and getlog which were always failing
* Raise a proper error when the task is not found in the database (status API)
* Fix dbs report for usage with multiple output datasets

And a new feature recently requested for CSA14:

* Add the possibility to blacklist site in case ignoreLocality is set