GRIF-465: Allow configure number of threads using for migration dates #541

Job	Run time
prepare-env	0s
gooddata-lcm-ruby-integration-e2e-zuul	0s
gooddata-lcm-ruby-integration-release-zuul	0s
gooddata-lcm-ruby-integration-others-zuul	0s
gooddata-ruby-integration-tests-zuul	0s
ready-to-merge	0s
gooddata-lcm-ruby-integration-userprov-zuul	-8s
gooddata-lcm-ruby-integration-slow-zuul	-9s
	-17s

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