fix channel broadcast bug && update test cases

Change-Id: Idacea6c17d8d1a9f50d23c8a1c2b8495961d86a8
update pomelo-admin

Change-Id: Idea50fefa0489dd54d771229c55b9119460fd774
fix socket.end bug

Change-Id: I2e11de0ff94d6ada7604db568a0ab39a9016fcc8
upgrade to 0.6.2

Change-Id: Ic9b8801cebe0b3f3523bb0aff8f093359b5fbb53