Revert r357504, r357491, r357482 because of bot breakage.

See discussion in https://reviews.llvm.org/D60001.

Revert Clean up windows build bot.
This reverts r357504 (git commit 380c2420)
Revert Fix buildbot where paths were not matching up.
This reverts r357491 (git commit 50505868)
Revert Allow partial UUID matching in Minidump core file plug-in
This reverts r357482 (git commit 838bba9c)

llvm-svn: 357534