add jobs:modify_queue/2

[uwiger]

Make it possible to tweak max_size and max_time via jobs:modify_queue(QueueName, Options)

[uwiger]

Example:

Eshell V5.10.3  (abort with ^G)
1> application:start(jobs).
ok
2> jobs:add_queue(q, [{regulators,[{rate,[{limit,100}]}]},{max_time,1000},{max_size,5000}]).
ok
3> jobs:queue_info(q, max_size).
5000
4> jobs:queue_info(q, max_time).
1000
5> jobs:modify_queue(q, [{max_size, 3000},{max_time,7000}]).
ok
6> jobs:queue_info(q, max_size).                            
3000
7> jobs:queue_info(q, max_time).                            
7000