Adding configurable telegraf parameters.
Allow to configurre remote endpoint/port/login/token
Proposed CLI:
```
set service monitoring telegraf authentication
login '[email protected]'organization 'vyos'
set service monitoring telegraf authentication token
'footokenfoo''54xxxtyw=='
set service monitoring telegraf
url 'foo.local:8086'bucket 'bucket'
set service monitoring telegraf
metrics daemons 'keepalived'port '8086'
set service monitoring telegraf
metrics daemons 'sshd'source 'all'
set service monitoring telegraf url 'http://foo.local'
```