Amster: Remove the 'from' option in authorized_keys

"Procedure 2.2. To Connect Locally With the Default Key Pair" should mention that the "from" parameter in the authorized_keys file may need to be edited, depending on network configuration.
https://backstage.forgerock.com/docs/amster/5/user-guide/chap-user-getting-started#default-private-login

Connecting locally with the default keypair, e.g.
connect --private-key /home/fr/openam/amster_rsa http://am5.example.com:8080/openam

Works fine as long as the connection takes place through the loopback interface since OpenAM creates an authorized_keys entry with "from="127.0.0.1/24,::1"

If another interface is used, the "from" needs to be edited to take this into account, otherwise amster fails with:
[code:401, reason:Unauthorized, message:Authentication Failed]