Reorder test runs.
Reorder test runs.

First do VS2015 since it is the most likely to break. Cygwin
is last because it is the slowest. Remove VS2017 because it
is being handled by Azure.

mesonbuild/meson,mesonbuild/meson,pexip/meson,jpakkane/meson,becm/meson,pexip/meson,pexip/meson,pexip/meson,mesonbuild/meson,QuLogic/meson,becm/meson,pexip/meson,mesonbuild/meson,becm/meson,MathieuDuponchelle/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,becm/meson,mesonbuild/meson,jpakkane/meson,becm/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,MathieuDuponchelle/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,MathieuDuponchelle/meson,QuLogic/meson,jpakkane/meson,MathieuDuponchelle/meson,pexip/meson,jpakkane/meson,MathieuDuponchelle/meson,becm/meson,mesonbuild/meson,becm/meson,mesonbuild/meson,MathieuDuponchelle/meson,pexip/meson,MathieuDuponchelle/meson,jpakkane/meson,pexip/meson,MathieuDuponchelle/meson,QuLogic/meson,becm/meson,becm/meson,MathieuDuponchelle/meson,QuLogic/meson,jpakkane/meson,QuLogic/meson,becm/meson,QuLogic/meson,pexip/meson