Adjusting barbican username and group in model

Change-Id: I3dff6d58b71be76c11e4b03036b2c6df83d0c29b
diff --git a/barbican/server/cluster.yml b/barbican/server/cluster.yml
index f540de2..60700a7 100644
--- a/barbican/server/cluster.yml
+++ b/barbican/server/cluster.yml
@@ -47,8 +47,3 @@
           home: /var/lib/barbican
           shell: /bin/bash
           system: True
-      group:
-        barbican:
-          enabled: true
-          name: barbican
-          system: True
diff --git a/barbican/server/single.yml b/barbican/server/single.yml
index ef27fb6..f004c85 100644
--- a/barbican/server/single.yml
+++ b/barbican/server/single.yml
@@ -45,8 +45,3 @@
           home: /var/lib/barbican
           shell: /bin/bash
           system: True
-      group:
-        barbican:
-          enabled: true
-          name: barbican
-          system: True