Use the PSK variant of CHACHA20-POLY1305
Use the PSK variant of CHACHA20-POLY1305

That's because there is no RSA variant in draft-ietf-tls-chacha20-poly1305-03

Signed-off-by: Nikos Mavrogiannopoulos <df6e1a462b5068e7cd37b5ebdba5d9f6b4da01fc@redhat.com>

nmav/openconnect-mine,cernekee/openconnect,mtmiller/openconnect,nmav/openconnect-mine,brandt/openconnect,nmav/openconnect-mine,cernekee/openconnect,mtmiller/openconnect,mtmiller/openconnect,cernekee/openconnect,brandt/openconnect,mtmiller/openconnect,brandt/openconnect,nmav/openconnect-mine,cernekee/openconnect,brandt/openconnect