[buildbucket] Disable luciexe tests on win
[buildbucket] Disable luciexe tests on win

butler tends to hang on windows. Disable luciexe tests on windows
until the butler is fixed.

R=9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org

Bug: 963705
Change-Id: Ia6d59a14040769403abbb17ed3c10d2884da00e7
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/1661013
Commit-Queue: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>
Auto-Submit: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Reviewed-by: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go