bus: check if D-Bus service name request was successful
bus: check if D-Bus service name request was successful

Solves issue #21 on github.

Change-Id: I71ef2be8b2a2fc8ff82410b6aed12c76140b5606
Signed-off-by: Waqar Hameed <d5c14662bf46e8e5d9de507114e98fd1658ebf51@axis.com>

openbmc/sdbusplus,openbmc/sdbusplus,openbmc/sdbusplus,openbmc/sdbusplus