Switch credential to maintenance-team-robot for build-config-drive job

Also drop ssh-agent custom code

PROD-37197

Change-Id: Id3ed14b8eee5e18c53afe97278034853c24c1174
diff --git a/jobs/templates/swarm-create-cfg-config-drive-jjb.yaml b/jobs/templates/swarm-create-cfg-config-drive-jjb.yaml
index 979ce74..3012008 100644
--- a/jobs/templates/swarm-create-cfg-config-drive-jjb.yaml
+++ b/jobs/templates/swarm-create-cfg-config-drive-jjb.yaml
@@ -121,7 +121,7 @@
         trim: 'false'
     - string:
         name: GERRIT_MCP_CREDENTIALS_ID
-        default: 'f4fb9dd6-ba63-4085-82f7-3fa601334d95'
+        default: 'maintenance-team-ssh'
         description: 'Credentials ID to access gerrit.mcp.mirantis.net'
         trim: 'false'
     - string: