Fix indentation in config files, set defaults for longer term runs

(opt-tsan-asan.json) and short term test runs (opt.json)

tools/run_tests/stress_test/configs/opt-tsan-asan.json

@@ -123,9 +123,9 @@
   },
 
   "globalSettings": {
-      "buildDockerImages": false,
-      "pollIntervalSecs": 10,
-      "testDurationSecs": 70,
+    "buildDockerImages": true,
+    "pollIntervalSecs": 60,
+    "testDurationSecs": 7200,
     "kubernetesProxyPort": 8001,
     "datasetIdNamePrefix": "stress_test_opt_tsan",
     "summaryTableId": "summary",
@@ -133,4 +133,3 @@
     "podWarmupSecs": 60
   }
 }
-

tools/run_tests/stress_test/configs/opt.json

@@ -73,9 +73,9 @@
   },
 
   "globalSettings": {
-      "buildDockerImages": false,
+    "buildDockerImages": true,
     "pollIntervalSecs": 10,
-      "testDurationSecs": 70,
+    "testDurationSecs": 120,
     "kubernetesProxyPort": 8001,
     "datasetIdNamePrefix": "stress_test_opt",
     "summaryTableId": "summary",

tools/run_tests/stress_test/run_on_gke.py

@@ -93,9 +93,8 @@ class ServerTemplate:
 
 
 class DockerImage:
-  """ Represents a docker image properties and has methods to build the image and
-
-  push it to GKE registry
+  """ Represents properties of a Docker image. Provides methods to build the
+  image and push it to GKE registry
   """
 
   def __init__(self, gcp_project_id, image_name, build_script_path,