Rename all Savanna usages to Sahara

There are several backward compatibility nits.

Change-Id: I93cac543375896602d158860cc557f86e41bcb63
diff --git a/extras.d/70-sahara.sh b/extras.d/70-sahara.sh
new file mode 100644
index 0000000..80e07ff
--- /dev/null
+++ b/extras.d/70-sahara.sh
@@ -0,0 +1,37 @@
+# sahara.sh - DevStack extras script to install Sahara
+
+if is_service_enabled sahara; then
+    if [[ "$1" == "source" ]]; then
+        # Initial source
+        source $TOP_DIR/lib/sahara
+        source $TOP_DIR/lib/sahara-dashboard
+    elif [[ "$1" == "stack" && "$2" == "install" ]]; then
+        echo_summary "Installing sahara"
+        install_sahara
+        cleanup_sahara
+        if is_service_enabled horizon; then
+            install_sahara_dashboard
+        fi
+    elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+        echo_summary "Configuring sahara"
+        configure_sahara
+        create_sahara_accounts
+        if is_service_enabled horizon; then
+            configure_sahara_dashboard
+        fi
+    elif [[ "$1" == "stack" && "$2" == "extra" ]]; then
+        echo_summary "Initializing sahara"
+        start_sahara
+    fi
+
+    if [[ "$1" == "unstack" ]]; then
+        stop_sahara
+        if is_service_enabled horizon; then
+            cleanup_sahara_dashboard
+        fi
+    fi
+
+    if [[ "$1" == "clean" ]]; then
+        cleanup_sahara
+    fi
+fi