A new ManagementAgent.status diagnostic command is introduced for querying the JMX agent's status.

The status will be relayed to the user in the following form:
```
Agent: <enabled|disabled>
(
  ConnectionType: <local|remote>
  Protocol: <rmi|...>
  Host: <IP or host name>
  URL: <valid JMX connector URL>
  (
    Properties:
    (
      <propertyname>=<propertyvalue>
    )+
  )?
)+

Where:
  <name> means an arbitrary value
  | means 'or'
  ( and ) denote a block
  + block repeats one or more times
  ? block appears at most once
```