devenv: switching back using loki master plus various fixes

devenv/docker/blocks/loki/docker-compose.yaml

@@ -1,24 +1,14 @@
-version: "3"
-
-networks:
-  loki:
-
-services:
   loki:
-    image: grafana/loki:master-3e6a75e
+    image: grafana/loki:master
     ports:
       - "3100:3100"
     command: -config.file=/etc/loki/local-config.yaml
-    networks:
-      - loki
 
   promtail:
-    image: grafana/promtail:master-3e6a75e
+    image: grafana/promtail:master
     volumes:
       - ./docker/blocks/loki/config.yaml:/etc/promtail/docker-config.yaml
       - /var/log:/var/log
       - ../data/log:/var/log/grafana
     command:
       -config.file=/etc/promtail/docker-config.yaml
-    networks:
-      - loki