Potential race condition in fetching processing.json

[fwip]

https://github.com/StamLab/stampipes/blob/master/scripts/flowcells/setup.sh#L153-L157

We tell LIMS "make this ready" and then ask for the results immediately after.
In two recent HiSeq flowcells, some of the flowcell_lanes in lanes 7 and/or 8 have been Project_None when processing.json was first fetched.

[fwip]

Supporting evidence in nginx logs:

2020/07/31 15:49:02 [error] 6#6: *3265547 upstream timed out (110: Connection timed out) while reading response header from upstream,  request: "PUT /api/flowcell_run/2086/prepare_for_processing/ HTTP/1.1", upstream: "api/flowcell_run/2086/prepare_for_processing/"