gitlab: Sync gitlab-paramteres.cfg to upstream

I manually reviewed

    files/gitlab-config-template/gitlab.rb.template
    files/gitlab-cookbooks/gitlab/attributes/default.rb

from omnibus-gitlab 8.4.2+ce.0-3-g68d5ee8 and picked up changes:

- unicorn OOM killer memory limits were raised up (because gitlab is now
  more memory hungry according to talks on gitlab.com)

  https://gitlab.com/gitlab-org/omnibus-gitlab/commit/f8ee4a19

- there is no default limit for nginx client_max_body_size - it just
  goes to gitlab-workhorse as is at any size

  https://gitlab.com/gitlab-org/omnibus-gitlab/commit/78862837

/cc @kazuhiko, @jerome

software/gitlab/gitlab-parameters.cfg

@@ -6,7 +6,7 @@
 #
 # TODO better autogenerate from ^^^ (?)
 #
-# (last updated for omnibus-gitlab 8.2.3+ce.0-0-g8eda093)
+# (last updated for omnibus-gitlab 8.4.2+ce.0-3-g68d5ee8)
 
 [gitlab-parameters]
 configuration.external_url              = http://lab.example.com
@@ -70,12 +70,12 @@ configuration.unicorn_worker_processes  = 2
 # unicorn advanced
 configuration.unicorn_backlog_socket    = 1024
 
-configuration.unicorn_worker_memory_limit_min   = 200*(1024**2)
-configuration.unicorn_worker_memory_limit_max   = 250*(1024**2)
+configuration.unicorn_worker_memory_limit_min   = 300*(1024**2)
+configuration.unicorn_worker_memory_limit_max   = 350*(1024**2)
 
 
 # nginx
-configuration.nginx_client_max_body_size    = 250m
+configuration.nginx_client_max_body_size    = 0
 
 # NOTE: we don't really need old ciphers - usually we talk directly to frontend only
 configuration.nginx_ssl_ciphers             = ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4

software/gitlab/software.cfg

@@ -231,7 +231,7 @@ md5sum  = 75f620ea0751fc8d2dc717cf929d29f3
 
 [gitlab-parameters.cfg]
 <= download-file
-md5sum  = 35352e9489e23994de353a6e59e4f2b0
+md5sum  = 2cfd3bbf9da10627044ca3a9a149fdbb
 
 [gitlab-shell-config.yml.in]
 <= download-template