added support in openvpn.py for password auth
added support in openvpn.py for password auth

lianke123321/centinel,rpanah/centinel,iclab/centinel,Ashish1805/centinel,rpanah/centinel,lianke123321/centinel,iclab/centinel,JASONews/centinel,rpanah/centinel,lianke123321/centinel,ben-jones/centinel,iclab/centinel