Adding support for vyatta

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+# Looking Glass: Vyatta/VyOS/EdgeOS configuration and tips.
+
+## Security and user access
+
+Unfortunately starting with EdgeOS [v1.9.7+hotfix.3](https://community.ubnt.com/t5/EdgeMAX-Updates-Blog/EdgeMAX-EdgeRouter-software-security-release-v1-9-7-hotfix-3/ba-p/2054117) release the shell access to the router is no longer possible for the operator users.
+
+Here is a quote:
+```
+[User account] WARNING! Disabled shell access for operator user. From now on operator
+user will have only WebUI access If operator user will try to access shell (via SSH or telnet)
+then error message "This account is currently not available" will be displayed and access
+will be denied. We decided to decrease operator user privileges for security reasons.
+```
+
+This of course complicates the things, and basically translates to the need for admin level (super-user) access.
+
+Please make sure that you understand security implications of this.
+
+# Configuration:
+
+Firstly create a new user with the admin level privileges:
+
+```
+[edit]
+set system login user <username> level admin
+```
+
+For security purpose, it is highly recommended to use an authentication mecanism based on SSH public keys. For that you can use one of the following commands:
+
+```
+[edit]
+user@router# set system login user <username> authentication ssh-rsa "<key>"
+[edit]
+user@router# set system login user <username> authentication ssh-dsa "<key>"
+[edit]
+user@router# set system login user <username> authentication ssh-ecdsa "<key>"
+```
+
+However if for your own reasons you prefer to use a password based authentication (you should not) you can use the encrypted-password or plain-text-password argument of the authentication command.
+
+To commit your changes to the router use:
+
+```
+[edit]
+user@router# show | compare
+...
+[edit]
+user@router# commit
+```
+
+## Debug
+
+Test the SSH/Telnet connection from the server where the looking glass is
+installed and you should see some outputs in your logs depending on your
+configuration.