[controller] move blob signature calculation from api to controller
Starting a lot of nodes that all read from the same large collection overloads the api server, with tons of ruby processes fighting over cpu. This happened on su92l today. It is possible that the blog signature calculation is the culprit. It would not be hard to move that code to controller.
2020-12-17T16:02:29.440839471Z /mnt/su92l-4zz18-9ghkf2xpro0ff9q/NA19732.haplotypeCalls.er.raw.vcf.gz phase 1: request failed: https://su92l.arvadosapi.com:443/arvados/v1/collections/su92l-4zz18-9ghkf2xpro0ff9q?select=%5B%22uuid%22%2C%22manifest_text%22%5D: 503 Service Unavailable: request failed: http://localhost:8000/arvados/v1/collections/su92l-4zz18-9ghkf2xpro0ff9q?select=%5B%22uuid%22%2C%22manifest_text%22%5D: 503 Service Unavailable