Read disposable performance from JSON

For: QubesOS/qubes-issues#1512

Author: ben-grande

extra-files/system-tests/dom0.sls

@@ -18,6 +18,7 @@ dom0-packages:
       - btrfs-progs
       - python3-nose2
       - python3-objgraph
+      - python3-deepmerge
       - patch
       - qubes-video-companion-dom0
       - split-gpg2-dom0

utils/lib/openqa_api.py

@@ -341,14 +341,11 @@ def get_performance_data(self):
 
 
         if 'dispvm_perf' in json_data['job']['name']:
-            for line in perf_data.split("\n"):
-                if not line:
-                    continue
-                data = line.split(" ")
-                name = data[0]
-                value = data[1]
-                data_dict = dict(item.split("=", maxsplit=1) for item in data[2:])
-                key = name + "(avg:" + data_dict["average"] + ")"
+            data = json.loads(perf_data)
+            for key, value in data.items():
+                name = value["name"]
+                mean = value["mean"]
+                key = name + "(mean:" + mean + ")"
                 result[key] = float(value)
             return result