.travis.yml: set go_import_path, use deploy feature

When pushing a PR to _my_ remote (github.com/ME), travis will send me an
email saying that it failed to build, and keeps failing, for every
update of the branch[1].

Setting this go_import_path properly should fix the build issue.

Furthermore, having successfully tested the package, our .travis.yml
used to check if this was a PR (it's not, in the context of a branch
pushed to a fork), and did some docker image related tasks. This is done
using the deployment feature of travis now.[2]

[1]: https://travis-ci.com/srenatus/opa/builds/86468169
[2]: https://docs.travis-ci.com/user/deployment

Signed-off-by: Stephan Renatus <srenatus@chef.io>

.travis.yml

@@ -1,5 +1,6 @@
 sudo: required
 language: go
+go_import_path: github.com/open-policy-agent/opa
 go:
 - "1.10"
 env:
@@ -8,10 +9,15 @@ env:
   - secure: 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
 services:
 - docker
-after_success:
-- source ./build/travis-utils.sh
-- if is_travis_push_env; then docker login -u $DOCKER_USER -p $DOCKER_PASSWORD; fi
-- if is_travis_push_env; then make image-quick; fi
-- if is_travis_push_env; then make push; fi
-- if is_travis_release_env; then make tag-latest; fi
-- if is_travis_release_env; then make push-latest; fi
+deploy:
+  - provider: script
+    script: make deploy-travis
+    on:
+      repo: open-policy-agent/opa
+      branch: master
+  - provider: script
+    script: make release-travis
+    on:
+      repo: open-policy-agent/opa
+      branch: master
+      tags: true

Makefile

@@ -80,6 +80,16 @@ push-latest:
 	docker push $(IMAGE):latest
 	docker push $(IMAGE):latest-debug
 
+.PHONY: docker-login
+docker-login:
+	@docker login -u ${DOCKER_USER} -p ${DOCKER_PASSWORD}
+
+.PHONY: deploy-travis
+deploy-travis: docker-login image-quick push
+
+.PHONY: release-travis
+release-travis: docker-login tag-latest push-latest
+
 .PHONY: install
 install: generate
 	$(GO) install -ldflags $(LDFLAGS)