kex: Add support for ecdsa hostkeys.
kex: Add support for ecdsa hostkeys.

wangshawn/libssh,bigcat26/libssh-mod,taikoo/libssh,mwgoldsmith/ssh,kedazo/libssh,wangshawn/libssh,pouete/libssh,mwgoldsmith/ssh,bigcat26/libssh-mod,mwgoldsmith/libssh,nviennot/libssh,jt1/honeypot-libssh,mwgoldsmith/libssh,elastichosts/libssh,DouglasHeriot/libssh,jt1/honeypot-libssh,bigcat26/libssh-mod,mwgoldsmith/libssh,DouglasHeriot/libssh,robxu9/libssh,pouete/libssh,taikoo/libssh,mwgoldsmith/ssh,kedazo/libssh,Distrotech/libssh,robxu9/libssh,sebadoom/libssh,robxu9/libssh,nviennot/libssh,jt1/honeypot-libssh,robxu9/libssh,elastichosts/libssh,pouete/libssh,mwgoldsmith/libssh,wangshawn/libssh,jt1/honeypot-libssh,Distrotech/libssh,taikoo/libssh,DouglasHeriot/libssh,sebadoom/libssh,nviennot/libssh,sebadoom/libssh,pouete/libssh,bigcat26/libssh-mod,sebadoom/libssh,nviennot/libssh,Distrotech/libssh,taikoo/libssh,mwgoldsmith/ssh,kedazo/libssh,kedazo/libssh,wangshawn/libssh,DouglasHeriot/libssh,elastichosts/libssh,Distrotech/libssh