PROD-36273 Alert about failed CFG bootstrapping became more informative

Change-Id: I9af6a2a85eeadd76dc93af89fd5dad69f587c392
diff --git a/tcp_tests/managers/envmanager_heat.py b/tcp_tests/managers/envmanager_heat.py
index 5fe143a..5422b1f 100644
--- a/tcp_tests/managers/envmanager_heat.py
+++ b/tcp_tests/managers/envmanager_heat.py
@@ -520,7 +520,9 @@
             helpers.wait(
                 lambda: _ssh_wait(node_ip, 22),
                 timeout=timeout,
-                timeout_msg="Node '{}' didn't open SSH in {} sec".format(
+                timeout_msg="Node '{}' didn't open SSH "
+                            "(or didn't complete cloud-init) "
+                            "in {} sec".format(
                     node['name'], timeout
                 )
             )