modify task mgr to pass a server_id to mycnf template

We would like to pass a server_id to the mysql template to allow for mysql master slave replication.

The current thought is that we could do something like this:

(but without using Salt of course)
https://github.com/saltstack/salt/blob/develop/salt/grains/core.py#L1277

...

def get_server_id():
    '''
    Provides an integer based on the FQDN of a machine.
    Useful as server-id in MySQL replication or anywhere else you'll need an ID like this.
    '''
    # Provides:
    # server_id
    return {'server_id': abs(hash(__opts__.get('id', '')) % (2 ** 31))}

...

we would use something like the server.id or instance_id for the hashed string.