.tools: commit validator is a separate project

Moving this tool to https://github.com/vbatts/git-validation so that
iteration on it will not be noise for this project.

Signed-off-by: Vincent Batts <[email protected]>

Author: vbatts

.tools/validate.go

@@ -9,11 +9,12 @@ sudo: false
 before_install:
   - go get golang.org/x/tools/cmd/vet
   - go get github.com/golang/lint/golint
+  - go get github.com/vbatts/git-validation
 
 install: true
 
 script:
   - go vet -x ./...
   - $HOME/gopath/bin/golint ./...
-  - go run .tools/validate.go -range ${TRAVIS_COMMIT_RANGE}
+  - $HOME/gopath/bin/git-validation -run DCO,short-subject -v -range ${TRAVIS_COMMIT_RANGE}