Refactor host_repo -> domain errors (#786)

* Refactor domain errors: New -> E, create helper New and Wrap
* Update host repo to use domain errors

internal/errors/option.go

@@ -14,6 +14,7 @@ type Option func(*Options)
 
 // Options - how Options are represented.
 type Options struct {
+	withCode       Code
 	withErrWrapped error
 	withErrMsg     string
 	withOp         Op
@@ -46,3 +47,11 @@ func WithOp(op Op) Option {
 		o.withOp = op
 	}
 }
+
+// WithCode provides an option to provide a code when creating a new
+// error.
+func WithCode(code Code) Option {
+	return func(o *Options) {
+		o.withCode = code
+	}
+}