Add unit test for watches created on object paths

Verify the watches created for the object path being watched
for 'interfaces added' signal.

Resolves openbmc/openbmc#3003

Change-Id: I88a3adbbe91fcbe5bdf606d2f460d4d0c6d9c1a2
Signed-off-by: Marri Devender Rao <devenrao@in.ibm.com>
4 files changed