add before validate script and fix travis problem

.travis.yml

@@ -15,7 +15,9 @@ install: true
 script:
   - go fmt ./... && [[ -z `git status -s` ]]
   - chmod u+x before_ut.sh && ./before_ut.sh
-  - chmod u+x validate_license.sh && ./validate_license.sh && [[ -z `git status -s` ]]
+  - chmod u+x before_validate_license.sh && ./before_validate_license.sh && [[ -z `git status -s` ]]
+  - chmod u+x tools/license/license-header-checker
+  - tools/license/license-header-checker -a -r -i vendor  tools/license/license.txt . go
   - go mod vendor && go test ./... -coverprofile=coverage.txt -covermode=atomic
 
 after_success:

validate_license.sh → before_validate_license.sh

@@ -24,6 +24,3 @@ licensePath="tools/license"
 mkdir -p ${licensePath}
 wget -P "${licensePath}" ${remoteLicenseCheckerURL}
 wget -P "${licensePath}" ${remoteLicenseURL}
-
-#more usage check: https://github.com/lsm-dev/license-header-checker
-${licensePath}/${remoteLicenseCheckerName} -a -r -i vendor  tools/license/license.txt . go