Add `lshal debug` command.

Supported command:
    lshal debug android.hardware.foo@1.0::IFoo option option

Test: adb unroot && lshal --debug ; echo $?
Test: adb unroot && lshal debug android.hardware.nfc@1.0::INfc ; echo $?
Test: adb root && lshal --debug ; echo $?
Test: adb root && lshal debug android.hardware.nfc@1.0::INfc ; echo $?

Bug: 37954458
Change-Id: Ia2f4c9c0d3fb0a7bb26e76f01d02f49dc426e7f8