dabbad: start dabbad with a proper default name.

On the server side, only the port number is needed to create a tcp
socket. However on the client side, an IPv4 address/hostname
and a port number is needed (e.g: localhost:55994)

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
doc: update dabbad POD documentation.

It mentions how the user can start a service as a tcp server listening a
specific port.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
Merge pull request #22 from eroullit/dabbad-tcp-def-name

dabbad: start dabbad with a proper default name.