Add Sentry client recipe and role

Configures a local domain for Sentry in the hostsfile.

nodes/akkounts-1.json

@@ -74,6 +74,7 @@
     "role[base]",
     "role[kvm_guest]",
     "role[ldap_client]",
+    "role[sentry_client]",
     "role[akkounts]"
   ]
-}
+}