Add an lshal command.

lshal lists services registered to the binderized
IServiceManager and all services available to the
passthrough IServiceManager as *.so libraries. It
also dumps the reference count for each service.

Bug: 34712252
Test: adb shell lshal
Change-Id: I9436a033cf736b8a8c307a2e87549c9db6379f3f