adb: switch the socket list mutex to a recursive_mutex. am: 6f641adea5 am: a6b92d1f2e am: 1f8c6c8c8e am: 163802c244  -s ours am: 46468f8cef
am: 44a8dfc152

Change-Id: Ie2254d28c7dc74480e240af1f364255d90c8373f