bitbake: fetch2: show warning when renaming the archive with bad checksum failed

bitbake: fetch2: show warning when renaming the archive with bad checksum failed

* noticed on read-only sshfs premirror
* it was showing the warning about renaming the file:
  WARNING: laser-geometry-1.6.4-r0 do_fetch: Renaming /jenkins/mjansa/sshfs/webos-ose-thud/downloads/laser_geometry-1.6.4.tar.gz to /jenkins/mjansa/sshfs/webos-ose-thud/downloads/laser_geometry-1.6.4.tar.gz_bad-checksum_1ee7479b8c5914b4ffae996945121441

  and then failed because of movefile() issue with python3 (fixed in previous commit):
  ERROR: laser-geometry-1.6.4-r0 do_fetch: Error executing a python function in exec_python_func() autogenerated:

  with movefile() fixed, it let do_fetch continue and re-fetch locally with the right
  checksum, but still the renamed file didn't exist, because of movefile failure - add
  another warning when the movefile fails - for whatever reason - unfortunately movefile
  prints error messages with just print() so the real error is hidden only in log.do_fetch
  in this case:
  movefile: Failed to move /jenkins/mjansa/sshfs/webos-ose-thud/downloads/laser_geometry-1.6.4.tar.gz to /jenkins/mjansa/sshfs/webos-ose-thud/downloads/laser_geometry-1.6.4.tar.gz_bad-checksum_1ee7479b8c5914b4ffae996945121441 [Errno 30] Read-only file system: '/jenkins/mjansa/sshfs/webos-ose-thud/downloads/laser_geometry-1.6.4.tar.gz' -> '/jenkins/mjansa/sshfs/webos-ose-thud/downloads/laser_geometry-1.6.4.tar.gz_bad-checksum_1ee7479b8c5914b4ffae996945121441'

(Bitbake rev: 9a1bf4ba9ec00c2a222d820f8f83d1f056b021d6)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>