Make OpenVPN username-as-common-name options. Implements #8289
(cherry picked from commit e5c4f2a7d977fb1fd6c7b4446e187486b72285be)
Make OpenVPN username-as-common-name options. Implements #8289
(cherry picked from commit e5c4f2a7d977fb1fd6c7b4446e187486b72285be)