IS-13: make the propagation delay configurable

Default value (1s) increases the duration of the test suite to approx 1min.

nmostesting/suites/IS1301Test.py

@@ -21,6 +21,7 @@
 Not covered yet:
 * Persistency: https://specs.amwa.tv/is-13/branches/v1.0-dev/docs/Behaviour.html#persistence-of-updates
 * Read only Tags: https://specs.amwa.tv/is-13/branches/v1.0-dev/docs/Behaviour.html#read-only-tags
+* Individual Tag reset
 * 500 reponses are ignored
 
 Terminology:
@@ -30,6 +31,7 @@
 
 from ..GenericTest import GenericTest, NMOSTestException
 
+from ..import Config as CONFIG
 from ..import TestHelper
 import re
 import copy
@@ -109,7 +111,7 @@ def set_resource(self, test, url, node_url, value, prev, expected, msg, link):
         # TODO: if put_response.status_code == 500:
 
         # pause to accomodate update propagation
-        time.sleep(0.1)
+        time.sleep(CONFIG.API_PROCESSING_TIMEOUT)
 
         # re-GET
         resp = self.get_resource(url)