Fixed typo in connect of signals between plugin and dbus adaptor

Signed-off-by: Sateesh Kavuri <sateesh.kavuri@gmail.com>
Fixed bug in decrementing the refcount and also updating active plugins

During stop of the oop plugin, the ref count and the active plugins
count is not updated. Fixed this bug. Now the successive sync's happen

Signed-off-by: Sateesh Kavuri <sateesh.kavuri@gmail.com>