Add object manager

Added object manager to sensor node so that it can be queried mapper
and GetManagedObjects method can be called.

Tested: verified this using busctl command and see object manager
interface has been added to this service.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Change-Id: I53e361ea81cabbba78aca2cec4939601d615d232
2 files changed