Update to use go modules (#671)

This includes updates to CI config, vendor files, etc.
I've hard-coded the k8s depedency at 1.13.4 to keep it inline with what
we currently have and to make sure a another run of `go mod tidy`
doesn't accidentally update it to an unexpected version.

Thanks to hectorj2f for carrying this along.

vendor/google.golang.org/grpc/tap/tap.go

@@ -21,7 +21,7 @@
 package tap
 
 import (
-	"golang.org/x/net/context"
+	"context"
 )
 
 // Info defines the relevant information needed by the handles.