unset some env variable

vpngen.py

@@ -172,6 +172,11 @@ class VpnGen:
               "-cert", "keys%sca.crt" % os.sep,
               "-out", "keys%scrl.pem" % os.sep,
               "-config", "openssl.cnf"])
+
+        del os.environ["KEY_OU"]
+        del os.environ["KEY_CN"]
+        del os.environ["KEY_NAME"]
+
         call(["openvpn", "--genkey", "--secret", "keys%sta.key" % os.sep])
 
         with open(conf_vpngen_file, "w") as f: