Update taskotron-trigger config

roles/taskotron/taskotron-trigger/templates/trigger.cfg.j2

@@ -1,6 +1,4 @@
 [buildbot]
-username = user
-password = password
 url = http://127.0.0.1:8080/change_hook
 
 [trigger]
@@ -9,9 +7,9 @@ koji_tag_changed_tasks = upgradepath,depcheck
 compose_completed_tasks =
 valid_arches = x86_64
 koji_url = http://koji.fedoraproject.org/kojihub
+datagrepper_url = https://apps.fedoraproject.org/datagrepper/raw
 execdb_server = {{ execdb_server }}
 type = BuildbotTrigger
-blacklist_releases = el5,el6,el7
 job_logging = True
 joblog_file = {{ trigger_joblog_file }}
 fuse_delay = 900 ; 15 minutes in seconds