locator: create/reset_snitch(): improve the error message for a not-supported case

Fixes issue #124

Signed-off-by: Vlad Zolotarov <vladz@cloudius-systems.com>

locator/snitch_base.hh

@@ -233,7 +233,7 @@ future<> i_endpoint_snitch::init_snitch_obj(
                 s->set_my_distributed(&snitch_obj);
                 local_inst = std::move(s);
             } catch (no_such_class& e) {
-                snitch_logger.error("{}", e.what());
+                snitch_logger.error("Can't create snitch {}: not supported", snitch_name);
                 throw;
             } catch (...) {
                 throw;