Update to use 5 minutes and no background task

Author: blink1073

source/auth/auth.rst

@@ -1120,20 +1120,14 @@ be used in lieu of manual caching.
 
 If using manual caching, the "Expiration" field MUST be stored
 and used to determine when to clear the cache.  Credentials are considered
-valid if they are more than one minute away from expiring, to the reduce the
+valid if they are more than five minutes away from expiring, to the reduce the
 chance of expiration before they are validated by the server.
 
 If there are no current valid cached credentials, the driver MUST initiate a
 credential request.  To avoid adding a bottleneck that would override the
 ``maxConnecting`` setting, the driver MUST not place a lock on making a
 request.  The cache MUST be written atomically.
 
-Once valid credentials are received, the driver SHOULD schedule an update of
-the cache within five minutes of the expiration time, unless the driver does not have the ability to schedule background tasks.  The background task MUST
-handle timeouts or errors and retry appropriately.  The purpose of the
-background task is to limit the chance of needing to initiate multiple
-simultaneous requests.
-
 If AWS authentication fails for any reason, the cache MUST be cleared.
 
 .. note::

source/auth/tests/mongodb-aws.rst

@@ -129,11 +129,11 @@ check for the absence of the AWS_ACCESS_KEY_ID and of credentials in the URI.
 #. Clear the cache.
 #. Create a new client.
 #. Ensure that a ``find`` operation adds credentials to the cache..
-#. Override the cached credentials with an "Expiration" that is within thirty
-   seconds of the current UTC time.
+#. Override the cached credentials with an "Expiration" that is within one
+   minute of the current UTC time.
 #. Create a new client.
 #. Ensure that a ``find`` operation updates the credentials in the cache.
-#. Poison the cache with garbage content.
+#. Poison the cache with invalid auth content.
 #. Create a new client.
 #. Ensure that a ``find`` operation results in an error.
 #. Ensure that the cache has been cleared.