Reading policy as json string (#43)

addPolicy endpoint will read policies as json string, this to allow
s3 iam policy compatibility (uppercase in json attributes) and to be
consistent with other mcs apis, once https://github.com/minio/minio/pull/9181
is merged we can return a type struct{}

fix policies test to new refactor

goimports

more golint fixes

models/add_policy_request.go

@@ -34,12 +34,13 @@ import (
 // swagger:model addPolicyRequest
 type AddPolicyRequest struct {
 
-	// definition
-	Definition string `json:"definition,omitempty"`
-
 	// name
 	// Required: true
 	Name *string `json:"name"`
+
+	// policy
+	// Required: true
+	Policy *string `json:"policy"`
 }
 
 // Validate validates this add policy request
@@ -50,6 +51,10 @@ func (m *AddPolicyRequest) Validate(formats strfmt.Registry) error {
 		res = append(res, err)
 	}
 
+	if err := m.validatePolicy(formats); err != nil {
+		res = append(res, err)
+	}
+
 	if len(res) > 0 {
 		return errors.CompositeValidationError(res...)
 	}
@@ -65,6 +70,15 @@ func (m *AddPolicyRequest) validateName(formats strfmt.Registry) error {
 	return nil
 }
 
+func (m *AddPolicyRequest) validatePolicy(formats strfmt.Registry) error {
+
+	if err := validate.Required("policy", "body", m.Policy); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // MarshalBinary interface implementation
 func (m *AddPolicyRequest) MarshalBinary() ([]byte, error) {
 	if m == nil {