Merge remote-tracking branch 'remotes/stsquad/tags/pull-testing-and-fpu-fixes-250319...

Mix of testing & fpu fixes

  - more splitting of Travis matric to avoid timeouts
  - Fused Multiply-Add fixes for MIPS and hardfloat
  - cleanups to docker travis emulation

# gpg: Signature made Mon 25 Mar 2019 10:44:44 GMT
# gpg:                using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8  DF35 FBD0 DB09 5A9E 2A44

* remotes/stsquad/tags/pull-testing-and-fpu-fixes-250319-1:
  docker: trivial changes to `make docker` help
  docker: Fix travis script unable to find source dir
  docker: Fix travis.py parser and misc change
  hardfloat: fix float32/64 fused multiply-add
  target/mips: Fix minor bug in FPU
  .travis.yml: reduce number of targets built while disabling things
  .travis.yml: --disable-user for --without-default-devices
  .travis.yml: split some more system builds
  configure: add --target-list-exclude

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>