QA: Enable all tests by default

This patch enables all tests by default, unless when they're
explicitely disabled in the config file. This will make sure
newly added tests are run even when an old configuration file
is used.

A comment is also added qa-sample.json.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

qa/qa-sample.json

@@ -66,8 +66,6 @@
     "instance-add-drbd-disk": true,
     "instance-convert-disk": true,
 
-    "instance-automatic-restart": false,
-    "instance-consecutive-failures": false,
     "instance-export": true,
     "instance-failover": true,
     "instance-import": true,
@@ -80,6 +78,10 @@
     "instance-rename": true,
     "instance-shutdown": true,
 
+    "# cron/ganeti-watcher should be disabled for these tests": null,
+    "instance-automatic-restart": false,
+    "instance-consecutive-failures": false,
+
     "# This test might fail with certain hypervisor types, depending": null,
     "# on whether they support the `gnt-instance console' command.": null,
     "instance-console": false,

qa/qa_config.py

@@ -60,8 +60,10 @@ def get(name, default=None):
 
 
 def TestEnabled(test):
-  """Returns True if the given test is enabled."""
-  return cfg.get('tests', {}).get(test, False)
+  """Returns True if the given test is enabled.
+
+  """
+  return cfg.get("tests", {}).get(test, True)
 
 
 def GetMasterNode():