Clean-up indirect dependencies (#226)

sarama was causing some other indirect dependencies. Upgrading it fixes
the issue.

We now have 3 indirect dependencies listed in go.mod:

- github.com/go-logfmt/logfmt
- github.com/go-stack/stack
- gopkg.in/jcmturner/goidentity.v3

go-kit accounts for the first two and sarama for the last one. Since
sarama does support go modules, this may be something missing on their
side.

go.mod

@@ -4,40 +4,30 @@ go 1.12
 
 require (
 	cloud.google.com/go v0.38.0
-	contrib.go.opencensus.io/exporter/ocagent v0.6.0 // indirect
 	contrib.go.opencensus.io/exporter/stackdriver v0.12.2
-	github.com/DataDog/zstd v1.3.5 // indirect
 	github.com/NYTimes/logrotate v1.0.0
-	github.com/Shopify/sarama v1.20.1
-	github.com/Shopify/toxiproxy v2.1.4+incompatible // indirect
+	github.com/Shopify/sarama v1.23.1
 	github.com/aws/aws-sdk-go v1.19.18
 	github.com/bradfitz/gomemcache v0.0.0-20180710155616-bc664df96737
-	github.com/eapache/go-resiliency v1.1.0 // indirect
-	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 // indirect
-	github.com/eapache/queue v1.1.0 // indirect
 	github.com/go-kit/kit v0.8.0
 	github.com/go-logfmt/logfmt v0.4.0 // indirect
 	github.com/go-stack/stack v1.8.0 // indirect
 	github.com/golang/protobuf v1.3.2
-	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
 	github.com/google/go-cmp v0.3.0
 	github.com/gorilla/context v1.1.1
 	github.com/gorilla/handlers v1.4.0
 	github.com/gorilla/mux v1.7.0
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0
 	github.com/kelseyhightower/envconfig v1.3.0
 	github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d
-	github.com/pierrec/lz4 v2.0.5+incompatible // indirect
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v0.9.2
-	github.com/prometheus/common v0.0.0-20181218105931-67670fe90761 // indirect
-	github.com/rcrowley/go-metrics v0.0.0-20181016184325-3113b8401b8a // indirect
 	github.com/sirupsen/logrus v1.3.0
-	github.com/smartystreets/goconvey v0.0.0-20190222223459-a17d461953aa // indirect
 	go.opencensus.io v0.22.0
 	golang.org/x/net v0.0.0-20190628185345-da137c7871d7
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
 	google.golang.org/api v0.7.0
 	google.golang.org/genproto v0.0.0-20190716160619-c506a9f90610
 	google.golang.org/grpc v1.22.0
+	gopkg.in/jcmturner/goidentity.v3 v3.0.0 // indirect
 )