Add a configurable timeout for calls to Cloud DNS API

Pyrax polls for a completed status internally, with a default timeout
of 5 seconds. Sometimes these requests take longer than 5 seconds to
complete, producing a DNSCallTimedOut exception. This makes that
timeout configurable.

Change-Id: I5af9f809c0214f2f1e32622041a46aeeb331e6b5

tests/endtoend/utils/config.py

@@ -160,6 +160,11 @@ class DNSConfig(data_interfaces.ConfigSectionInterface):
         """Int value to set timeout for dns polling."""
         return int(self.get('retry_timeout'))
 
+    @property
+    def dns_api_timeout(self):
+        """The timeout when waiting for Cloud DNS API requests to complete"""
+        return int(self.get('dns_api_timeout'))
+
     @property
     def authoritative_nameserver(self):
         """The authoritative nameserver to query, must be an ip address."""

tests/endtoend/utils/dnsclient.py

@@ -25,12 +25,13 @@ class RackspaceDNSClient(object):
 
     """Client Objects for Rackspace DNS call."""
 
-    def __init__(self, user_name, api_key, test_domain):
+    def __init__(self, user_name, api_key, test_domain, dns_api_timeout=15):
         super(RackspaceDNSClient, self).__init__()
 
         pyrax.settings.set('identity_type', 'rackspace')
         pyrax.set_credentials(user_name, api_key)
         self.dns_client = pyrax.cloud_dns
+        self.dns_client.set_timeout(dns_api_timeout)
         self.test_domain = test_domain
         self.domain = self.dns_client.find(name=test_domain)