Added info option for jupnp command line tool.

* added info commandline args and command implementation
* added test cases for info command
* refactored test cases (UpnpService can be mocked now)
* refactored out IpAddressUtils

Signed-off-by: Jochen Hiller <jo.hiller@googlemail.com> (github:
@jochenhiller)
Are you sure you want to add real devices with real serial numbers in the code here? Or is this a fake number?