Support custom TIME_ZONE option in localsettings

This patch aims to add support for customization of TIME_ZONE option
which may be needed by global users.

Closes-Bug: #1553835

Change-Id: Id7b2c6776c0021b7c887ad6c4a4de8d15801984b

manifests/init.pp

@@ -265,6 +265,10 @@
 #    the user is logged out.
 #    Defaults to 1800.
 #
+#  [*timezone*]
+#    (optional) The timezone of the server.
+#    Defaults to 'UTC'.
+#
 # === Examples
 #
 #  class { 'horizon':
@@ -327,6 +331,7 @@ class horizon(
   $overview_days_range                 = undef,
   $root_url                            = $::horizon::params::root_url,
   $session_timeout                     = 1800,
+  $timezone                            = 'UTC',
   # DEPRECATED PARAMETERS
   $can_set_mount_point                 = undef,
   $vhost_extra_params                  = undef,

spec/classes/horizon_init_spec.rb

@@ -72,6 +72,7 @@ describe 'horizon' do
           "    'enable_security_group': True,",
           "    'enable_vpn': False,",
           'API_RESULT_LIMIT = 1000',
+          'TIME_ZONE = "UTC"',
           'COMPRESS_OFFLINE = True',
           "FILE_UPLOAD_TEMP_DIR = '/tmp'"
         ])
@@ -115,7 +116,8 @@ describe 'horizon' do
           :keystone_multidomain_support => true,
           :keystone_default_domain      => 'domain.tld',
           :overview_days_range          => 1,
-          :session_timeout              => 1800
+          :session_timeout              => 1800,
+          :timezone                     => 'Asia/Shanghai',
         })
       end
 
@@ -153,6 +155,7 @@ describe 'horizon' do
           'OPENSTACK_ENDPOINT_TYPE = "internalURL"',
           'SECONDARY_ENDPOINT_TYPE = "ANY-VALUE"',
           'API_RESULT_LIMIT = 4682',
+          'TIME_ZONE = "Asia/Shanghai"',
           "CUSTOM_THEME_PATH = 'static/themes/green'",
           "            'level': 'DEBUG',",
           "            'handlers': ['syslog'],",

templates/local_settings.py.erb

@@ -477,7 +477,7 @@ API_RESULT_PAGE_SIZE = 20
 
 # The timezone of the server. This should correspond with the timezone
 # of your entire OpenStack installation, and hopefully be in UTC.
-TIME_ZONE = "UTC"
+TIME_ZONE = "<%= @timezone %>"
 
 # If you have external monitoring links, eg:
 <% if @horizon_app_links %>