Remove the _initialize_config_options

Currently the nova_notifier have a special code to differentiate the
test code and normal execution.

Remove this special code by passing the agent manager as parameter in
test code.

Change-Id: I6e0746e891c7c8006175cb310684dd6caa35ccda
Signed-off-by: Yunhong, Jiang <yunhong.jiang@intel.com>
Merge "Remove the _initialize_config_options"