bitbake: process: Fix disconnect when BB_SERVER_TIMEOUT

bitbake: process: Fix disconnect when BB_SERVER_TIMEOUT

Fixed:
$ export BB_SERVER_TIMEOUT=10000
$ bitbake --server-only
$ bitbake --status-only
[snip]
  File "/buildarea/lyang1/poky/bitbake/lib/bb/server/process.py", line 472, in recvfds
    msg, ancdata, flags, addr = sock.recvmsg(1, socket.CMSG_LEN(bytes_size))
OSError: [Errno 9] Bad file descriptor

And:
$ export BB_SERVER_TIMEOUT=10000
$ bitbake --server-only -B localhost:-1
$ bitbake --status-only # Everything is fine in first run
$ bitbake --status-only
[snip]
  File "/buildarea/lyang1/poky/bitbake/lib/bb/server/process.py", line 472, in recvfds
    msg, ancdata, flags, addr = sock.recvmsg(1, socket.CMSG_LEN(bytes_size))
OSError: [Errno 9] Bad file descriptor

This was because self.controllersock was not set to False, so it still ran
sock.recvmsg() when sock was closed.

And also need set command_channel to Flase, otherwise the
self.command_channel.get() will always run when EOF, and cause infinite loop.

(Bitbake rev: 7b739a38601b053d9bea4df2c0b44a952ab670c4)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>