Feature/filestorage securityservices create (#132)

* sfs: Add support for security services Create

* sfs: Add acceptance tests for security service Create

* sfs: Fix comments
diff --git a/openstack/sharedfilesystems/v2/securityservices/results.go b/openstack/sharedfilesystems/v2/securityservices/results.go
new file mode 100644
index 0000000..e34692d
--- /dev/null
+++ b/openstack/sharedfilesystems/v2/securityservices/results.go
@@ -0,0 +1,52 @@
+package securityservices
+
+import "github.com/gophercloud/gophercloud"
+
+// SecurityService contains all the information associated with an OpenStack
+// SecurityService.
+type SecurityService struct {
+	// The security service ID
+	ID string `json:"id"`
+	// The UUID of the project where the security service was created
+	ProjectID string `json:"project_id"`
+	// The security service domain
+	Domain string `json:"domain"`
+	// The security service status
+	Status string `json:"status"`
+	// The security service type. A valid value is ldap, kerberos, or active_directory
+	Type string `json:"type"`
+	// The security service name
+	Name string `json:"name"`
+	// The security service description
+	Description string `json:"description"`
+	// The DNS IP address that is used inside the tenant network
+	DNSIP string `json:"dns_ip"`
+	// The security service user or group name that is used by the tenant
+	User string `json:"user"`
+	// The user password, if you specify a user
+	Password string `json:"password"`
+	// The security service host name or IP address
+	Server string `json:"server"`
+	// The date and time stamp when the security service was created
+	CreatedAt gophercloud.JSONRFC3339MilliNoZ `json:"created_at"`
+	// The date and time stamp when the security service was updated
+	UpdatedAt gophercloud.JSONRFC3339MilliNoZ `json:"updated_at"`
+}
+
+type commonResult struct {
+	gophercloud.Result
+}
+
+// Extract will get the SecurityService object out of the commonResult object.
+func (r commonResult) Extract() (*SecurityService, error) {
+	var s struct {
+		SecurityService *SecurityService `json:"security_service"`
+	}
+	err := r.ExtractInto(&s)
+	return s.SecurityService, err
+}
+
+// CreateResult contains the response body and error from a Create request.
+type CreateResult struct {
+	commonResult
+}