Revert "add docker service"

This reverts commit 652fb25c43.

.travis.yml

@@ -7,7 +7,6 @@ go_import_path: github.com/vmware/harbor
 
 service: 
   - mysql
-  - docker
 
 env: GO15VENDOREXPERIMENT=1 DB_HOST=127.0.0.1 DB_PORT=3306 DB_USR=root DB_PWD=
 
@@ -27,5 +26,3 @@ script:
   - go list ./... | grep -v /vendor/ | xargs -L1 fgt golint
   - go list ./... | grep -v 'vendor' | xargs -L1 go vet
   - go list ./... | grep -v 'vendor' | xargs -L1 go test -v
-  - docker version
-  - docker-compose version