Add all_tenants to nova servers list
diff --git a/openstack/compute/v2/servers/requests.go b/openstack/compute/v2/servers/requests.go
index f186e04..63ad24b 100644
--- a/openstack/compute/v2/servers/requests.go
+++ b/openstack/compute/v2/servers/requests.go
@@ -49,6 +49,9 @@
 
 	// Integer value for the limit of values to return.
 	Limit int `q:"limit"`
+
+	// Bool to show all tenants
+	AllTenants bool `q:"all_tenants"`
 }
 
 // ToServerListQuery formats a ListOpts into a query string.