Have apiclient reach out to deploycfg server

If we already have deploycfg, use that to indicate the
target server rather than copernicus data.

confluent_osdeploy/common/opt/confluent/bin/apiclient

@@ -66,6 +66,15 @@ class HTTPSClient(client.HTTPConnection, object):
                 ifout.write(ifidx)
         if json:
             self.stdheaders['ACCEPT'] = 'application/json'
+        try:
+            info = open('/etc/confluent/confluent.deploycfg').read().split('\n')
+        except Exception:
+            info = None
+        if info:
+            for line in info:
+                if line.startswith('deploy_server: '):
+                    host = line.split(': ', 1)[1]
+                    break
         self.stdheaders['CONFLUENT_APIKEY'] = get_apikey(node, host)
         if mgtiface:
             self.stdheaders['CONFLUENT_MGTIFACE'] = mgtiface