Bump kubernetes to 1.15 (#2683)

- rewrite GetStorage calls in pkg/registry/servicecatalog
- FeatureGate imports updated to new package
- change plugin/pkg/admission test calls to NewAttributeRecord()
- bump github.com/google/gofuzz to 1.0.0 to comply with apimachinery
- enable tls 13 in Makefile

.travis.yml

@@ -45,7 +45,7 @@ jobs:
           # ensure the tests build
           make verify build svcat build-integration build-e2e
         fi
-      env: GO_VERSION=1.11
+      env: GO_VERSION=1.12
     # Doc Site svc-cat.io
     - stage: test
       script:

Gopkg.toml

@@ -392,7 +392,7 @@ required = [
 
 [[override]]
   name = "github.com/google/gofuzz"
-  revision = "44d81051d367757e1c7c6a5a86423ece9afcf63c"
+  revision = "f140a6486e521aad38f5917de355cbf147cc0496"
 
 [[override]]
   name = "github.com/google/uuid"
@@ -859,27 +859,27 @@ required = [
   revision = "5420a8b6744d3b0345ab293f6fcba19c978f1183"
 
 [[override]]
-  branch = "release-1.14"
+  branch = "release-1.15"
   name = "k8s.io/api"
 
 [[override]]
-  branch = "release-1.14"
+  branch = "release-1.15"
   name = "k8s.io/apiextensions-apiserver"
 
 [[override]]
-  branch = "release-1.14"
+  branch = "release-1.15"
   name = "k8s.io/apimachinery"
 
 [[override]]
-  branch = "release-1.14"
+  branch = "release-1.15"
   name = "k8s.io/apiserver"
 
 [[override]]
-  branch = "release-11.0"
+  branch = "release-12.0"
   name = "k8s.io/client-go"
 
 [[override]]
-  branch = "release-1.14"
+  branch = "release-1.15"
   name = "k8s.io/code-generator"
 
 [[override]]

Makefile

@@ -94,7 +94,7 @@ TEST_BROKER_MUTABLE_IMAGE         = $(REGISTRY)test-broker-$(ARCH):$(MUTABLE_TAG
 HEALTHCHECK_IMAGE                 = $(REGISTRY)healthcheck-$(ARCH):$(VERSION)
 HEALTHCHECK_MUTABLE_IMAGE         = $(REGISTRY)healthcheck-$(ARCH):$(MUTABLE_TAG)
 ifdef UNIT_TESTS
-	UNIT_TEST_FLAGS=-run $(UNIT_TESTS) -v
+	UNIT_TEST_FLAGS=-run $(UNIT_TESTS) -v --env GODEBUG tls13=1
 endif
 
 ifdef INT_TESTS