allow scaling a mongodb to 0 replicas #1636
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Olliewer
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mircea-cosbuc,
lsierant,
slaskawi,
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Summary:
It is possible to set the number of mongodb members and arbiters to 0 (at the same time).
Therefore it is possible to scale the mongodb down if it is not needed.
The edge case is has been included that the number of members and arbiters can be equal if both are 0.
closes #1635