OpenVPN: Added auth and cipher menu, changed design, fixed bugs.

OpenVPN: Added auth and cipher menu, changed design, fixed bugs.

Added --auth directive with a flip menu for N2N and RW.
Added cipher menu for N2N.
Added new cipher and digest algorithm.
Adapted OpenVPN WUI design to IPSec design.
Changed key lenght for certificates with factor 2.
Added DH menu to WUI, with DH upload possibility and separated DH generation possibility.
Several Bugfixes, reference can be found under Bug #10463.
Also Fixes for #10317 and #10149.