Replace ssh with Qnapware OpenSSH

Note: Work in progress.

Recommend changing QNAP system sshd to use any port other than 22.  (Like 2222 or something)

1. Install Entware for opkg support (Note that this replaces the older non-supported as of Dec-2014 Optware)
2. opkg install openssh-server
3. ssh-keygen -t rsa -f ssh_host_rsa_key
4. ssh-keygen -t dsa -f ssh_host_dsa_key
5. Add sshd user to /etc/passwd and sshd group to /etc/group
   • echo sshd:x:74:>>/etc/group
   • echo sshd:x:74:74:Priviledge-separated SSH:/var/empty/sshd:/sbin/nologin>>/etc/passwd
6. ..