Add query integration tests to check against Prometheus

By generating the same dataset in Prometheus, we can use the remote read
API to validate our query results versus Prometheus on the same data.

go.mod

@@ -3,10 +3,10 @@ module github.com/timescale/timescale-prometheus
 go 1.14
 
 require (
+	github.com/OneOfOne/xxhash v1.2.5 // indirect
 	github.com/allegro/bigcache v1.2.1
 	github.com/docker/go-connections v0.4.0
-	github.com/fzipp/gocyclo v0.0.0-20150627053110-6acd4345c835 // indirect
-	github.com/go-kit/kit v0.9.0
+	github.com/go-kit/kit v0.10.0
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang-migrate/migrate/v4 v4.9.1
 	github.com/golang/snappy v0.0.1
@@ -15,10 +15,10 @@ require (
 	github.com/jackc/pgproto3/v2 v2.0.1
 	github.com/jackc/pgx/v4 v4.4.1
 	github.com/jamiealquiza/envy v1.1.0
-	github.com/prometheus/client_golang v1.0.0
-	github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4
-	github.com/prometheus/common v0.6.0
-	github.com/prometheus/prometheus v0.0.0-20190710134608-e5b22494857d
+	github.com/prometheus/client_golang v1.5.1
+	github.com/prometheus/client_model v0.2.0
+	github.com/prometheus/common v0.9.1
+	github.com/prometheus/prometheus v1.8.2-0.20200326161412-ae041f97cfc6
 	github.com/spf13/cobra v0.0.7 // indirect
 	github.com/testcontainers/testcontainers-go v0.3.1
 )