makefile: use revive for style checking

Switch use of style checker from golint to revive for both the makefile
and travis configuration.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

.travis.yml

@@ -20,11 +20,10 @@ before_install: |
   docker build --build-arg CEPH_REPO_URL="${CEPH_REPO_URL}" -t ceph-golang-ci .
 
 before_script:
-  - go get golang.org/x/lint/golint
+  - go get github.com/mgechev/revive
 
 # cephfs (fuse) requires: --device /dev/fuse --cap-add SYS_ADMIN --security-opt apparmor:unconfined
 script:
   - docker run --device /dev/fuse --cap-add SYS_ADMIN --security-opt apparmor:unconfined --rm -it -v ${PWD}:/go/src/github.com/ceph/go-ceph:z ceph-golang-ci
-# run golint and other style checks
-  - go get golang.org/x/lint/golint
+# run style checks
   - make check

Makefile

@@ -23,5 +23,6 @@ test-docker: .build-docker
 	@$(CONTAINER_CMD) inspect -f '{{.Id}}' $(DOCKER_CI_IMAGE) > .build-docker
 
 check:
-	# TODO: add this when golint is fixed	@for d in $$(go list ./... | grep -v /vendor/); do golint -set_exit_status $${d}; done
-	@for d in $$(go list ./... | grep -v /vendor/); do golint $${d}; done
+	# Configure project's revive checks using .revive.toml
+	# See: https://github.com/mgechev/revive
+	@for d in $$(go list ./... | grep -v /vendor/); do revive -config .revive.toml $${d}; done