fix some port config and missed stable specs

deploy/ansible/worker/include/install_geth.yml

@@ -10,8 +10,8 @@
         state: directory
         mode: '0755'
 
-    - name: "pull ethereum/client-go:latest"
+    - name: "pull ethereum/client-go:stable"
       become: yes
       docker_image:
-        name: ethereum/client-go:latest
+        name: ethereum/client-go:stable
         source: pull

deploy/ansible/worker/include/run_external_geth.yml

@@ -16,7 +16,6 @@
         volumes:
           - /home/nucypher/geth:/root
         ports:
-          - "8545/tcp"
-          - "30303/tcp"
-          - "8546/tcp"
-          - "30303/udp"
+          - "8545:8545/tcp"
+          - "30303:30303"
+          - "8546:8546/tcp"