Replaced OpenVPN in strings with OpenConnect

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
external: Update libopenconnect to address JNI local reference leaks

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
libs: Sync openconnect with latest sources

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Add "TRACE logging" global setting

Allow the user to request PRG_TRACE instead of PRG_DEBUG output.  This
generates a log entry per packet, so it may be expensive.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>