Dump client PIDs for passthrough HALs.

* This is done with registerPassthroughClient in IServiceManager; when a
  service is retrieved through the passthrough service manager, its PID
  will be recoreded by the binderized service manager.
* The action of dumping all available dynamic libraries is now done by
  dumpAllLibraries.
Bug: 34712252
Test: lshal

Change-Id: I7f08e3255ffed0f46435843504e0e225d0d9bbc9