software/monitor: Deleted non ASCII characters(°C) for node-monitoring.json...

software/monitor: Deleted non ASCII characters(°C) for node-monitoring.json files causing errors with https://lab.nexedi.com/nexedi/slapos/blob/master/slapos/test/test_json_schema.py#L85 (see option  ensure_ascii=False for json.dumps())

software/monitor/instance-node-monitoring-input-schema.json

@@ -11,14 +11,14 @@
     },
     "promise_cpu_temperature_threshold": {
       "default": "90",
-      "title": "CPU temperature promise threshold (unit: °C)",
-      "description": "Temperature threshold above which CPU temperature promise will fail (unit: °C)",
+      "title": "CPU temperature promise threshold (unit: Celsius)",
+      "description": "Temperature threshold above which CPU temperature promise will fail (unit: Celsius)",
       "type": "number"
     },
     "promise_cpu_avg_temperature_threshold": {
       "default": "80",
-      "title": "Average CPU temperature promise threshold (unit: °C)",
-      "description": "If average temperature over specified duration reaches this threshold, promise will fail (unit: °C)",
+      "title": "Average CPU temperature promise threshold (unit: Celsius)",
+      "description": "If average temperature over specified duration reaches this threshold, promise will fail (unit: Celsius)",
       "type": "number"
     },
     "promise_cpu_avg_temperature_threshold_duration": {

software/monitor/instance-node-monitoring-output-schema.json

@@ -8,11 +8,11 @@
       "type": "number"
     },
     "promise_cpu_temperature_threshold": {
-      "description": "Temperature threshold above which CPU temperature promise will fail (unit: °C)",
+      "description": "Temperature threshold above which CPU temperature promise will fail (unit: Celsius)",
       "type": "number"
     },
     "promise_cpu_avg_temperature_threshold": {
-      "description": "If average temperature over specified duration reaches this threshold, promise will fail (unit: °C)",
+      "description": "If average temperature over specified duration reaches this threshold, promise will fail (unit: Celsius)",
       "type": "number"
     },
     "promise_cpu_avg_temperature_threshold_duration": {