cinder: configure dlm when this one is zookeeper

Previous this was set the zake, but that was revert to missing
dependencies issue and because zake is a test fixture and not somthing
to deploy.

This change configures the Cinder dlm with this one is zookeeper.
And it installs tooz and the extra dependencies needed for the
zookeeper driver.

To do it, this commit have to introduce a new method for package
installation: 'pip_install_gr_extras package extra1,extra2'.

Change-Id: Idca310c08e345db59840eb31434c6cb1f849fa70

inc/python

@@ -69,6 +69,20 @@ function pip_install_gr {
     pip_install $clean_name
 }
 
+# Wrapper for ``pip install`` that only installs versions of libraries
+# from the global-requirements specification with extras.
+#
+# Uses globals ``REQUIREMENTS_DIR``
+#
+# pip_install_gr_extras packagename extra1,extra2,...
+function pip_install_gr_extras {
+    local name=$1
+    local extras=$2
+    local clean_name
+    clean_name=$(get_from_global_requirements $name)
+    pip_install $clean_name[$extras]
+}
+
 # Determine the python versions supported by a package
 function get_python_versions_for_package {
     local name=$1

lib/cinder

@@ -373,6 +373,13 @@ function configure_cinder {
     iniset $CINDER_CONF DEFAULT os_privileged_user_password "$SERVICE_PASSWORD"
     iniset $CINDER_CONF DEFAULT os_privileged_user_tenant "$SERVICE_PROJECT_NAME"
     iniset $CINDER_CONF DEFAULT graceful_shutdown_timeout "$SERVICE_GRACEFUL_SHUTDOWN_TIMEOUT"
+
+    # Set the backend url according to the configured dlm backend
+    if is_dlm_enabled; then
+        if [[ "$(dlm_backend)" == "zookeeper" ]]; then
+            iniset $CINDER_CONF coordination backend_url "zookeeper://${SERVICE_HOST}:2181"
+        fi
+    fi
 }
 
 # create_cinder_accounts() - Set up common required cinder accounts

lib/dlm

@@ -91,6 +91,7 @@ function configure_dlm {
 # install_dlm() - Collect source and prepare
 function install_dlm {
     if is_dlm_enabled; then
+        pip_install_gr_extras tooz zookeeper
         if is_ubuntu; then
             install_package zookeeperd
         elif is_fedora; then