dabba: fix server id option on capture start/stop.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabbad: exit when server could not be created.

Signed-off-by: Emmanuel Roullit <emmanuel.roullit@gmail.com>
dabba: exit on service connection failure.

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