Exercise quantum v2 api without namespace

Added quantum_v2.sh for quantum v2 api exercise.

Quantum exercise script requires the following settings:
- Q_USE_NAMESPACE=False
- LIBVIRT_FIREWALL_DRIVER=nova.virt.firewall.NoopFirewallDriver

And the following services enabled:
- quantum, q-svc, q-agt, q-dhcp

Change-Id: I5767f94c94187a4ca0fd189244fa6f5781519ab4
diff --git a/stack.sh b/stack.sh
index e6576e0..dafff2b 100755
--- a/stack.sh
+++ b/stack.sh
@@ -269,7 +269,8 @@
 Q_ADMIN_USERNAME=${Q_ADMIN_USERNAME:-quantum}
 # Default auth strategy
 Q_AUTH_STRATEGY=${Q_AUTH_STRATEGY:-keystone}
-
+# Use namespace or not
+Q_USE_NAMESPACE=${Q_USE_NAMESPACE:-True}
 
 # Name of the lvm volume group to use/create for iscsi volumes
 VOLUME_GROUP=${VOLUME_GROUP:-stack-volumes}
@@ -1204,6 +1205,7 @@
     iniset $Q_DHCP_CONF_FILE DEFAULT verbose True
     # Set debug
     iniset $Q_DHCP_CONF_FILE DEFAULT debug True
+    iniset $Q_DHCP_CONF_FILE DEFAULT use_namespaces $Q_USE_NAMESPACE
 
     # Update database
     iniset $Q_DHCP_CONF_FILE DEFAULT db_connection "mysql:\/\/$MYSQL_USER:$MYSQL_PASSWORD@$MYSQL_HOST\/$Q_DB_NAME?charset=utf8"