Moench: Acquire blocking function with callback

[anberga]

*Detector type:

Will be mainly used for moench

*Software Package Version:

Priority:

Low

*State the feature:

Implement a new sls_detector_acquire (sls_detector_acquire_acquire_zmq ?) with an empty data callback, such that it waits until all data have been processed for moench.

Is your feature request related to a problem. Please describe:

acquire returns before the data have been processed and all the time sequence messes up.

Describe the solution you'd like:

Wait until the Zmq process returns

Describe alternatives you've considered:

Additional context:

[thattil]

@erikfrojdh : Erik's suggestion: http request or something similar waited if set up to wait for in shared memory.