Devenv:LDAP: couple simplifications for LDAP (#17807)

* Add LDAP config instead sed use

* Add container name

* Add SizeLimit option to client and to server.
  Probably useless at this point, but it's better to have it then otherwise

pkg/services/ldap/ldap.go

@@ -261,6 +261,7 @@ func (server *Server) getSearchRequest(
 	return &ldap.SearchRequest{
 		BaseDN:       base,
 		Scope:        ldap.ScopeWholeSubtree,
+		SizeLimit:    1000,
 		DerefAliases: ldap.NeverDerefAliases,
 		Attributes:   attributes,
 		Filter:       filter,