Need new VMMS that supports one job at a time on a particular machine

[droh]

To help reduce jitter on performance-sensitive assignments like malloc, we need a new docker vmms that will allow us to specifify a list of physical machines, and that schedules at most one job per physical machine.

[victorhuangwq]

Need clarification on whether this is still a required feature.

[cg2v]

There was a later (~2018) proposal to resolve the malloc jitter issue by allowing autolab to support multiple tangos, and use a separate serialized (localDocker with only one vm preallocated) tango for malloc.