puppet: Stop creating a /home/zulip/logs.

This was last really used in d7a3570c7e, in 2013, when it was
`/home/humbug/logs`.

Repoint the one obscure piece of tooling that writes there, and remove
the places that created it.

puppet/zulip/manifests/app_frontend_base.pp

@@ -181,7 +181,6 @@ class zulip::app_frontend_base {
 
   file { [
     '/home/zulip/tornado',
-    '/home/zulip/logs',
     '/home/zulip/prod-static',
     '/home/zulip/deployments',
     '/srv/zulip-npm-cache',

puppet/zulip_ops/files/supervisor/conf.d/zmirror.conf

@@ -1,5 +1,5 @@
 [program:zmirror]
-command=/home/zulip/python-zulip-api/zulip/integrations/zephyr/zephyr_mirror.py --site=https://zephyr.zulipchat.com --stamp-path=/home/zulip/ --user=tabbott/extra --forward-class-messages --log-path=/home/zulip/logs/mirror-log --on-startup-command="/home/zulip/python-zulip-api/zulip/integrations/zephyr/zmirror-renew-kerberos"
+command=/home/zulip/python-zulip-api/zulip/integrations/zephyr/zephyr_mirror.py --site=https://zephyr.zulipchat.com --stamp-path=/home/zulip/ --user=tabbott/extra --forward-class-messages --log-path=/var/log/zulip/mirror-log --on-startup-command="/home/zulip/python-zulip-api/zulip/integrations/zephyr/zmirror-renew-kerberos"
 priority=200                   ; the relative start priority (default 999)
 autostart=true                 ; start at supervisord start (default: true)
 autorestart=true               ; whether/when to restart (default: unexpected)

scripts/lib/upgrade-zulip-from-git

@@ -50,7 +50,6 @@ if args.remote_url:
     remote_url = args.remote_url
 
 os.makedirs(DEPLOYMENTS_DIR, exist_ok=True)
-os.makedirs("/home/zulip/logs", exist_ok=True)
 
 error_rerun_script = f"{DEPLOYMENTS_DIR}/current/scripts/upgrade-zulip-from-git {refname}"
 get_deployment_lock(error_rerun_script)