adding X509 authentication of host

[JacobBarthelmeh]

Interop. testing with pkixssh

sshd_config used

cat sshd_config 
Port 22222
Protocol 2
LoginGraceTime 600
PermitRootLogin yes
PasswordAuthentication yes
PermitEmptyPasswords no
UsePrivilegeSeparation no
UseDNS no

TrustedUserCAKeys /home/jak/Documents/wolfssh-fork/keys/ca-cert-ecc.pem
#CACertificateFile /home/jak/Documents/wolfssh-fork/keys/ca-cert-ecc.pem
HostKey /home/jak/Documents/wolfssh-fork/keys/server-key.pem
HostCertificate /home/jak/Documents/wolfssh-fork/keys/server-cert.der

wolfSSH as the host

cd wolfssh
sudo ./apps/wolfsshd/wolfsshd -D -d -f sshd_config -p 22222

cd pkixssh
 ./ssh -p 22222 -o"CACertificateFile /home/jak/Documents/wolfssh-fork/keys/ca-cert-ecc.pem" -i id_john john@127.0.0.1

pkixssh as the host

cd pkixssh
sudo /home/jak/Documents/pkixssh/sshd -f ./sshd_config -p 22222 -D -o"CACertificateFile /home/jak/Documents/wolfssh-fork/keys/ca-cert-ecc.pem"


cd wolfssh
./examples/client/client -u john -J ./keys/john-cert.der -i ./keys/john-key.der -A ./keys/ca-cert-ecc.der -t