Delete app and ics-openvpn-stripped, legacy stuff.

We don't use that data anymore, we generate ics-openvpn-stripped from
ics-openvpn using gradle, and then a "normal" branch imports those
changes via gradle too.
Plain ics-openvpn at r885. Will modify now.
Rebuilt ics-openvpn repo with our customizations.

hg verify reports no errors.