dabbad: use local socket connection by default.

The current implementation has neither encryption nor authentication
support. To mitigate risks local socket are used by default.
The TCP server option remain present but must be explicitely used.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: make --tcp and --local use optional args.

when no argument is given the proper default values are taken, yet the
requested connection method is used.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabba: make --tcp and --local use optional args.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>