Add "insecure" flag to graph LDAP backend

To allow skipping TLS Certificate verification in development
environments.

graph/pkg/config/config.go

@@ -37,6 +37,7 @@ type Spaces struct {
 
 type LDAP struct {
 	URI           string `ocisConfig:"uri" env:"GRAPH_LDAP_URI"`
+	Insecure      bool   `ocisConfig:"insecure" env:"OCIS_INSECURE;GRAPH_LDAP_INSECURE"`
 	BindDN        string `ocisConfig:"bind_dn" env:"GRAPH_LDAP_BIND_DN"`
 	BindPassword  string `ocisConfig:"bind_password" env:"GRAPH_LDAP_BIND_PASSWORD"`
 	UseServerUUID bool   `ocisConfig:"use_server_uuid" env:"GRAPH_LDAP_SERVER_UUID"`

graph/pkg/config/defaultconfig.go

@@ -30,6 +30,7 @@ func DefaultConfig() *Config {
 			Backend: "cs3",
 			LDAP: LDAP{
 				URI:                      "ldap://localhost:9125",
+				Insecure:                 false,
 				BindDN:                   "",
 				BindPassword:             "",
 				UseServerUUID:            false,