stop using redundant appveyor builds

appveyor.yml

@@ -1,35 +0,0 @@
-# appveyor.yml reference : http://www.appveyor.com/docs/appveyor-yml
-
-version: "{build}"
-
-skip_tags: true
-
-branches:
-  only:
-    - master
-
-os: Windows Server 2012 R2
-
-environment:
-  GOPATH: c:\gopath
-
-clone_folder: c:\gopath\src\github.com\hashicorp\packer
-
-install:
-  - set GO111MODULE=off
-  - echo %Path%
-  - go version
-  - go env
-
-build_script:
-  - git rev-parse HEAD
- # go test $(go list ./... | grep -v vendor)
-  - ps: |
-      go.exe test -timeout=2m (go.exe list ./... `
-      |? { -not $_.Contains('/vendor/') } `
-      |? { $_ -ne 'github.com/hashicorp/packer/builder/parallels/common' } `
-      |? { $_ -ne 'github.com/hashicorp/packer/provisioner/ansible' })
-
-test: off
-
-deploy: off