Inconsistent memory req/lim between single-userserver and user-placeholder

[dev-dsp]

Bug description

My configuration

singleuser:
  memory:
    limit: 1800M
    guarantee: 1800M
scheduling:
  userPlaceholder:
    enabled: true
    replicas: 4

Results in

$ kubectl describe pod jupyter-...
Containers:
  notebook:
    Limits:
      cpu:     2
      memory:  1887436800
    Requests:
      cpu:     500m
      memory:  1887436800


$ kubectl describe pod user-placeholder-...
Containers:
  pause:
    Limits:
      cpu:     2
      memory:  1800M
    Requests:
      cpu:        500m
      memory:     1800M

So 1887436800 bytes obviously is 1800Mi(B), which is 1887,4368 M(B), so not what I've requested. 1800M is a correct notation for MB, and should result in 1800000000 bytes (~1717 MiB)

For my HW this means that VM can fit 3 user-servers and 4 user-placeholders :shrug:

Configuration

Z2JH 3.2.1