Maintain two APNS connections and send correct notifications to each

Now we have 2 different Zulip apps out there, and they are signed with
two certs: Zulip and Dropbox. The Dropbox-signed apps are going to need
to be sent APNS notifications from the appropriate APNS connection

(imported from commit 6db50c5811847db4f08e5c997c7bbb4b46cfc462)

zproject/local_settings.py

@@ -126,10 +126,12 @@ if DEPLOYED or STAGING_DEPLOYED:
     APNS_SANDBOX = "push_production"
     APNS_FEEDBACK = "feedback_production"
     APNS_CERT_FILE = "/etc/ssl/django-private/apns-dist.pem"
+    DBX_APNS_CERT_FILE = "/etc/ssl/django-private/dbx-apns-dist.pem"
 else:
     APNS_SANDBOX = "push_sandbox"
     APNS_FEEDBACK = "feedback_sandbox"
     APNS_CERT_FILE = "/etc/ssl/django-private/apns-dev.pem"
+    DBX_APNS_CERT_FILE = "/etc/ssl/django-private/dbx-apns-dev.pem"
 
 # GCM tokens are IP-whitelisted; if we deploy to additional
 # servers you will need to explicitly add their IPs here:
@@ -208,3 +210,6 @@ API_SUPER_USERS = set(["tabbott/extra@mit.edu",
 ADMINS = (
     ('Zulip Error Reports', 'errors@zulip.com'),
 )
+
+ZULIP_IOS_APP_ID = 'com.zulip.Zulip'
+DBX_IOS_APP_ID = 'com.dropbox.Zulip'

zproject/settings.py

@@ -297,6 +297,7 @@ DEFAULT_SETTINGS = {'TWITTER_CONSUMER_KEY': '',
                     'EXTERNAL_URI_SCHEME': "https://",
                     'GOOGLE_CLIENT_ID': '',
                     'REDIS_PASSWORD': None,
+                    'DBX_APNS_CERT_FILE': None,
                     }
 
 for setting_name, setting_val in DEFAULT_SETTINGS.iteritems():