[manual] Rename /var/log/humbug to /var/log/zulip.

This requires a "puppet apply" to be done to create /var/log/zulip
before we deploy anything using the new directory.

(imported from commit 2d7baedbf923df9f01b152cf0bda6494f0eac936)

servers/puppet/modules/zulip/manifests/base.pp

@@ -100,7 +100,7 @@ class zulip::base {
     subscribe  => File['/etc/ssh/sshd_config'],
   }
 
-  file { '/var/log/humbug':
+  file { '/var/log/zulip':
     ensure => 'directory',
     owner  => 'humbug',
     group  => 'humbug',

servers/puppet/modules/zulip/manifests/supervisor.pp

@@ -4,7 +4,7 @@ class zulip::supervisor {
 
   service { "supervisor":
     ensure => running,
-    require => [File["/var/log/humbug"],
+    require => [File["/var/log/zulip"],
                 Package["supervisor"],
                 ],