am: 11082d3a

* commit '11082d3a':
  adb: use asocket's close function when closing.
  adb: switch the socket list mutex to a recursive_mutex.
  adb: clang-format sockets.cpp.
  adb: add implementations of mutex, recursive_mutex.

Change-Id: I76ee3a8d2de618c57b3696e78261fdbb917edab8