resource name nbs are too short

[osrf-migration]

Original report (archived issue) by Hugo Boyer (Bitbucket: hugomatic, GitHub: hugomatic).

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3 characters is small, and will rollover soon.
string compare won't guarantee order.

A better fix would be to split resource name into:

an id (could be a uuid)
a creation time (for sorting, unless the id has increment part)
a type ("simulator", etc)

The current scheme requires to call the database INCR to generate a unique resource name. This operation is asynchronous and could be avoided.