Fix linter exemptions in golint

We were having issues with golint not properly reporting declaration of functions
without proper documentation (comments). This is due to a config with golangci.

See: https://github.com/golangci/golangci-lint/issues/456

internal/lock/monitor.go

@@ -31,6 +31,8 @@ type Subscription interface {
 	Value() Value
 }
 
+// Value contains the last set value from Set(). If the value is unset the version will be 0, and the value will be
+// nil.
 type Value struct {
 	Value   interface{}
 	Version int64