Clean up local state paths

Puts additional state and lock paths for swift, quantum and nova
into $DATA_DIR/project that can be set independently of $DEST.

Change-Id: I2cca701856d3caa7fe472fefdd8b070a3c7f3adf
diff --git a/stack.sh b/stack.sh
index 3fc3204..1702509 100755
--- a/stack.sh
+++ b/stack.sh
@@ -503,7 +503,7 @@
 
 # Set ``SWIFT_DATA_DIR`` to the location of swift drives and objects.
 # Default is the common DevStack data directory.
-SWIFT_DATA_DIR=${SWIFT_DATA_DIR:-${DEST}/data/swift}
+SWIFT_DATA_DIR=${SWIFT_DATA_DIR:-${DATA_DIR}/swift}
 
 # Set ``SWIFT_CONFIG_DIR`` to the location of the configuration files.
 # Default is ``/etc/swift``.
@@ -1439,6 +1439,7 @@
     # Set debug
     iniset $Q_DHCP_CONF_FILE DEFAULT debug True
     iniset $Q_DHCP_CONF_FILE DEFAULT use_namespaces $Q_USE_NAMESPACE
+    iniset $Q_DHCP_CONF_FILE DEFAULT state_path $DATA_DIR/quantum
 
     quantum_setup_keystone $Q_DHCP_CONF_FILE DEFAULT set_auth_url