Disable resource group jobs from pipeline due to security reasons

It is insecurity to run priviledged containers on public pipelines, so
disable resource group jobs until a new priviledged VM mechanism can be
provided.

concourse/pipelines/pipeline.yml

@@ -567,26 +567,6 @@ jobs:
     params:
       TEST_OS: centos
 
-- name: regression_tests_resource_group
-  plan:
-  - aggregate:
-    - get: gpdb_src
-      passed: [compile_gpdb_centos6]
-    - get: bin_gpdb
-      resource: bin_gpdb_centos6
-      passed: [compile_gpdb_centos6]
-      trigger: true
-    - get: centos-gpdb-dev-6
-  - task: ic_gpdb_resgroup
-    file: gpdb_src/concourse/tasks/ic_gpdb_resgroup.yml
-    privileged: true
-    image: centos-gpdb-dev-6
-    params:
-      MAKE_TEST_COMMAND: PGOPTIONS='-c optimizer=off -c codegen=off' installcheck-resgroup
-      BLDWRAP_POSTGRES_CONF_ADDONS: "fsync=off"
-      TEST_OS: centos
-
-
 - name: regression_tests_gpcloud_centos
   plan:
   - aggregate: