Add admin credential config for network client.

 * Supports bug 1043980

Change-Id: I5ffc2d57a19e9f3a8112308998f0b957b7d93b1f
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index cc91716..d537396 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -185,6 +185,17 @@
 # Catalog type of the Quantum Service
 catalog_type = network
 
+[network-admin]
+# This section contains configuration options for an administrative
+# user of the Network API.
+
+# This should be the username of a user WITH administrative privileges
+username = admin
+# The above administrative user's password
+password = pass
+# The above administrative user's tenant name
+tenant_name = admin
+
 [identity-admin]
 # This section contains configuration options for an administrative
 # user of the Compute API. These options are used in tests that stress