adb: use asocket's close function when closing.

close_all_sockets was assuming that all registered local sockets used
local_socket_close as their close function. However, this is not true
for JDWP sockets.

Bug: http://b/28347842
Change-Id: I40a1174845cd33f15f30ce70828a7081cd5a087e
(cherry picked from commit 53eb31d8)