How-to enable SSH login message banner in ESXi 5.x

1. Login to your ESXi 5.x server via SSH as root.
2. Create a backup of the original file by: cp /etc/issue /etc/issue.bak
3. Use vi editor to open the issue config file: vi /etc/issue
4. Enter your message and save and quit VI editor
5. Restart the SSH daemon by: /etc/init.d/SSH restart