Change usage of retry-after header

With this change the retry-after header will be treated as an absolute value and not used for exponential backoff.
Whenever the retry-after interval sent by the service broker is larger than the calculated interval using the base interval and exponential backoff, the retry-after interval will be used. When the CC calculated interval is larger the retry-after interval will be ignored.

Author: svkrieger

app/jobs/reoccurring_job.rb

@@ -30,7 +30,7 @@ def maximum_duration_seconds=(duration)
       end
 
       def polling_interval_seconds
-        [@polling_interval || 0, default_polling_interval_seconds].max
+        @polling_interval || 0
       end
 
       def polling_interval_seconds=(interval)
@@ -59,7 +59,7 @@ def default_polling_exponential_backoff
       end
 
       def next_execution_in
-        polling_interval_seconds * (default_polling_exponential_backoff**retry_number)
+        [polling_interval_seconds, default_polling_interval_seconds * (default_polling_exponential_backoff**retry_number)].max
       end
 
       def next_enqueue_would_exceed_maximum_duration?