Misc cleanups

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# gpg: Signature made Tue 03 May 2022 06:12:20 AM PDT
# gpg:                using RSA key 87A9BD933F87C606D276F62DDAE8E10975969CE5
# gpg:                issuer "marcandre.lureau@redhat.com"
# gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>" [full]
# gpg:                 aka "Marc-André Lureau <marcandre.lureau@gmail.com>" [full]

* tag 'misc-pull-request' of gitlab.com:marcandre.lureau/qemu: (23 commits)
  util: rename qemu_*block() socket functions
  tests: replace qemu_set_nonblock()
  net: replace qemu_set_nonblock()
  ui: replace qemu_set_nonblock()
  hw: replace qemu_set_nonblock()
  qga: replace qemu_set_nonblock()
  io: replace qemu_set{_non}block()
  chardev: replace qemu_set_nonblock()
  io: make qio_channel_command_new_pid() static
  Replace fcntl(O_NONBLOCK) with g_unix_set_fd_nonblocking()
  io: replace pipe() with g_unix_open_pipe(CLOEXEC)
  virtiofsd: replace pipe() with g_unix_open_pipe(CLOEXEC)
  os-posix: replace pipe()+cloexec with g_unix_open_pipe(CLOEXEC)
  tests: replace pipe() with g_unix_open_pipe(CLOEXEC)
  qga: replace pipe() with g_unix_open_pipe(CLOEXEC)
  util: replace pipe()+cloexec with g_unix_open_pipe()
  Replace qemu_pipe() with g_unix_open_pipe()
  block: move fcntl_setfl()
  Use g_unix_set_fd_nonblocking()
  libqtest: split QMP part in libqmp
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>