Added options for cipher, verb, persist-key, persist-tun server directives. Added options for KEY_EXPIRE, CA_EXPIRE, KEY_NAME, KEY_OU, KEY_CN easy-rsa vars.

Hi,

I added support for nine variables, 4 of them to further tune the server openvpn configuration, 5 of them to further tune the easy-rsa vars.

I'm pushing the 9 vars as one change in the extensions branch. I also have separate feature branches for each of the variables if you wish.

Last but not least, each variable is accompanied with a documenting line as well.

Best Regards,
Ewout