Add a build info metric (#323)

* Add a build info metric

Add a standard Prometheus build info metric to make monitoring rollouts
easier.

* Update prometheus vendoring.

* Fix build error

Fix missing bool in builtinMetricMaps.

Signed-off-by: Ben Kochie <superq@gmail.com>

vendor/github.com/prometheus/procfs/Makefile

@@ -1,18 +1,29 @@
-ci: fmt lint test
+# Copyright 2018 The Prometheus Authors
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
-fmt:
-	! gofmt -l *.go | read nothing
-	go vet
+include Makefile.common
 
-lint:
-	go get github.com/golang/lint/golint
-	golint *.go
-
-test: sysfs/fixtures/.unpacked
-	go test -v ./...
-
-sysfs/fixtures/.unpacked: sysfs/fixtures.ttar
-	./ttar -C sysfs -x -f sysfs/fixtures.ttar
+%/.unpacked: %.ttar
+	@echo ">> extracting fixtures"
+	./ttar -C $(dir $*) -x -f $*.ttar
 	touch $@
 
-.PHONY: fmt lint test ci
+update_fixtures:
+	rm -vf fixtures/.unpacked
+	./ttar -c -f fixtures.ttar fixtures/
+
+.PHONY: build
+build:
+
+.PHONY: test
+test: fixtures/.unpacked common-test