Starting and restarting DataStax agents

Commands for starting and restarting DataStax agents for each type of installation.

Procedure

To start the DataStax agent:
- Packaged installs: The DataStax agent starts automatically.
- Tarball installs: $ install_location bin/datastax-agent (Use -f to start in the foreground.)
- Windows installs: Start the DataStax Agent Service from the Control Panel.
To restart the DataStax agent:
- Packaged installs: $ sudo service datastax-agent restart
- Tarball installs: Find the DataStax agent Java process ID (PID), kill the process using its PID number, and start the DataStax agent:
```
$ ps -ef | grep datastax-agent
$ sudo kill <pid>
```
  $ bin/datastax-agent (Use -f to start in the foreground.)
- Windows installs: Restart the DataStax Agent Service from the Control Panel.

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