dcaegen2 jobs updates for jjb migration

1) Removed dublin branches across all jobs
2) Switched to centos7-docker-8c-8g for docker dependent builds
3) Removed dcaegen2-service clm (subproject has own clm job)
4) Cleaned up old release job (replaced by gerrit-maven jobs)

Change-Id: If77bdf431e0189d774d80b285ec1b0ca98c09d6b
Signed-off-by: Vijay Venkatesh Kumar <vv770d@att.com>
Issue-ID: DCAEGEN2-1669
Issue-ID: DCAEGEN2-1578
Signed-off-by: Vijay Venkatesh Kumar <vv770d@att.com>
diff --git a/jjb/dcaegen2/dcaegen2-collectors-datafile-csit.yaml b/jjb/dcaegen2/dcaegen2-collectors-datafile-csit.yaml
index 6740dae..6be71b3 100644
--- a/jjb/dcaegen2/dcaegen2-collectors-datafile-csit.yaml
+++ b/jjb/dcaegen2/dcaegen2-collectors-datafile-csit.yaml
@@ -7,8 +7,6 @@
     stream:
       - 'master':
           branch: 'master'
-      - 'dublin':
-          branch: 'dublin'
     functionality:
       - 'ManagementInterface-suite':
           trigger_jobs:
@@ -17,4 +15,4 @@
           trigger_jobs:
            - '{project-name}-{stream}-docker-java-shell-daily'
     robot-options: ''
-    branch: 'master'
\ No newline at end of file
+    branch: 'master'