Add a way to disable build summary

List what was built/failed/skipped is quite long and not always
interesting. Add a way to disable it.

Change-Id: If171102e665dba627bac30ae81deee2d3ab10595

kolla/common/config.py

@@ -252,7 +252,9 @@ _CLI_OPTS = [
     cfg.BoolOpt('quiet', short='q', default=False,
                 help='Do not print image logs'),
     cfg.BoolOpt('enable-unbuildable', default=False,
-                help='Enable images marked as unbuildable')
+                help='Enable images marked as unbuildable'),
+    cfg.BoolOpt('summary', default=True,
+                help='Show summary at the end of build')
 ]
 
 _BASE_OPTS = [

kolla/image/build.py

@@ -1453,8 +1453,9 @@ def run_build():
             build_queue.put(WorkerThread.tombstone)
             raise
 
-    results = kolla.summary()
+    if conf.summary:
+        results = kolla.summary()
+        if conf.format == 'json':
+            print(json.dumps(results))
     kolla.cleanup()
-    if conf.format == 'json':
-        print(json.dumps(results))
     return kolla.get_image_statuses()

releasenotes/notes/new-option-summary-3acc4e62a0c7ac40.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Added new option "--(no)summary" to allow to hide after build summary.