Cleanup packages (#53)

* Remove unused packages

* Remove separate module for k8sevent input

Author: djaglowski

go.mod

@@ -4,29 +4,27 @@ go 1.14
 
 require (
 	github.com/antonmedv/expr v1.8.2
-	github.com/cenkalti/backoff/v4 v4.0.2
 	github.com/json-iterator/go v1.1.10
 	github.com/kr/text v0.2.0 // indirect
 	github.com/mitchellh/mapstructure v1.4.1
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/observiq/ctimefmt v1.0.0
 	github.com/observiq/go-syslog/v3 v3.0.2
 	github.com/observiq/nanojack v0.0.0-20201106172433-343928847ebc
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/stretchr/objx v0.1.1 // indirect
 	github.com/stretchr/testify v1.6.1
 	go.etcd.io/bbolt v1.3.4
 	go.uber.org/zap v1.15.0
 	golang.org/x/exp v0.0.0-20200224162631-6cc2880d07d6 // indirect
 	golang.org/x/lint v0.0.0-20200302205851-738671d3881b // indirect
-	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
 	golang.org/x/sys v0.0.0-20201015000850-e3ed0017c211
 	golang.org/x/text v0.3.3
 	golang.org/x/tools v0.0.0-20200904185747-39188db58858 // indirect
 	gonum.org/v1/gonum v0.6.2
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/yaml.v2 v2.3.0
 	honnef.co/go/tools v0.0.1-2020.1.5 // indirect
+	k8s.io/api v0.19.0
+	k8s.io/apimachinery v0.19.0
+	k8s.io/client-go v0.19.0
 )