[automerger skipped] Merge "Add testRegisterTetheringEventCallback for CtsTetheringTest" into rvc-dev am: f29ce3caf3 am: bed4903891 -s ours
am skip reason: Change-Id I55895c8b26acb7ec905d75d1f4b2a8964b13187a with SHA-1 64522ba4ea is in history
Change-Id: Ie6ce302ee18d330ec0fa666dc62f0f5aa3329974
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