Add .gitkeep to tmp/sockets.
Add .gitkeep to tmp/sockets.

gaapt/bookyt,hauledev/bookyt,huerlisi/bookyt,silvermind/bookyt,xuewenfei/bookyt,gaapt/bookyt,huerlisi/bookyt,wtag/bookyt,silvermind/bookyt,hauledev/bookyt,xuewenfei/bookyt,gaapt/bookyt,hauledev/bookyt,silvermind/bookyt,huerlisi/bookyt,silvermind/bookyt,gaapt/bookyt,wtag/bookyt,wtag/bookyt,hauledev/bookyt,xuewenfei/bookyt