Auth (#1147)

Implement the Auth interface, with JWT and service implementations.

* Update Auth Interface

* Define Auth Service Implementation

* Support Service Auth

* Add Auth Service Proto

* Remove erronious files

* Implement Auth Service Package

* Update Auth Interface

* Update Auth Interface. Add Validate, remove Add/Remove roles

* Make Revoke interface more explicit

* Refactor serializing and deserializing service accounts

* Fix srv name & update interface to be more explicit

* Require jwt public key for auth

* Rename Variables (Resource.ID => Resource.Name & ServiceAccount => Account)

* Implement JWT Auth Package

* Remove parent, add ID

* Update auth imports to v2. Add String() to auth interface

auth/default.go

@@ -0,0 +1,34 @@
+package auth
+
+var (
+	DefaultAuth Auth = new(noop)
+)
+
+type noop struct {
+	options Options
+}
+
+// String name of implementation
+func (a *noop) String() string {
+	return "noop"
+}
+
+// Init the svc
+func (a *noop) Init(...Option) error {
+	return nil
+}
+
+// Generate a new auth Account
+func (a *noop) Generate(id string, ops ...GenerateOption) (*Account, error) {
+	return nil, nil
+}
+
+// Revoke an authorization Account
+func (a *noop) Revoke(token string) error {
+	return nil
+}
+
+// Validate a  account token
+func (a *noop) Validate(token string) (*Account, error) {
+	return nil, nil
+}