Merge remote-tracking branch 'remotes/juanquintela/tags/check/20180827' into staging

Merge remote-tracking branch 'remotes/juanquintela/tags/check/20180827' into staging

check/next for 20180827

# gpg: Signature made Mon 27 Aug 2018 10:58:51 BST
# gpg:                using RSA key F487EF185872D723
# gpg: Good signature from "Juan Quintela <[email protected]>"
# gpg:                 aka "Juan Quintela <[email protected]>"
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03  4B82 F487 EF18 5872 D723

* remotes/juanquintela/tags/check/20180827:
  check: Move wdt_ib700 test to common
  check: Move endianess test to common
  check: Move VMXNET3 test to common
  check: Only test boot-serial when sga is compiled in
  check: Only test ivshm when it is compiled in
  x86_64-softmmu: Configuration is identical to i386-softmmu
  check: Only test usb-xhci-nec when it is compiled in
  check: Only test isa-testdev when it is compiled in
  configure: We don't want to clean configuration files

Signed-off-by: Peter Maydell <[email protected]>