ZAPI-542: Reduce parallel queue concurrency for the heartbeater
ZAPI-542: Reduce parallel queue concurrency for the heartbeater
richardkiene/sdc-vmapi,joyent/sdc-vmapi,richardkiene/sdc-vmapi,arekinath/sdc-vmapi,misterdjules/sdc-vmapi,misterdjules/sdc-vmapi,joyent/sdc-vmapi,arekinath/sdc-vmapi