zuul_stream : Use !127.0.0.1 for loopback

This is a follow-on to Ia78ad9e3ec51bc47bf68c9ff38c0fcd16ba2e728 to
use a different loopback address for the local connection to the
Python 2.7 container.  This way, we don't have to override the
existing localhost/127.0.0.1 matches that avoid the executor trying to
talk to a zuul_console daemon.  These bits are removed.

The comment around the port settings is updated while we're here.

Change-Id: I33b2198baba13ea348052e998b1a5a362c165479

playbooks/zuul-stream/2.7-container.yaml

@@ -18,4 +18,4 @@
 - name: Accept host keys
   shell: |
     ssh-keyscan -p 2022 localhost >> ~/.ssh/known_hosts
-    ssh-keyscan -p 2022 127.0.0.1 >> ~/.ssh/known_hosts
+    ssh-keyscan -p 2022 127.0.0.2 >> ~/.ssh/known_hosts

playbooks/zuul-stream/create-inventory.yaml

@@ -23,7 +23,7 @@
         hosts:
           node3:
             ansible_connection: ssh
-            ansible_host: 127.0.0.1
+            ansible_host: 127.0.0.2
             ansible_port: 2022
             ansible_user: root
             ansible_python_interpreter: /usr/local/bin/python2.7

playbooks/zuul-stream/functional.yaml

@@ -19,7 +19,6 @@
         ZUUL_JOB_LOG_CONFIG: "{{ ansible_user_dir}}/logging.json"
         ZUUL_JOBDIR: "{{ ansible_user_dir}}"
         PYTHONPATH: "{{ python_path }}"
-        ZUUL_CONSOLE_STREAM_LOCALHOST: 1
       register: _success_output
 
     - name: Save raw output to file