workaround for cd not working with python popen

ghost-openstack/scripts/ghost/ghost.py

@@ -72,9 +72,11 @@ def start(subject=None):
     
     writeConfig(subject)
     
-    _run('(cd /opt/ghost/ && sudo /usr/bin/npm install)',error_message='Failed running npm install')
-    _run('(cd /opt/ghost/ && sudo /usr/bin/npm start &)',error_message='Failed running npm start')
-
+    pwd = os.getcwd()
+    os.chdir('/opt/ghost')
+    _run('sudo /usr/bin/npm install',error_message='Failed running npm install')
+    _run('sudo /usr/bin/npm start &',error_message='Failed running npm start')
+    os.chdir(pwd)
 
 def stop():
     _run('sudo killall node',error_message='Failed killing nodejs')