Seperate ids for demo and deploy branches

[pimvullers]

For example +10000 for demo ids. See also credentials_api issue #4: credentials/credentials_api#4

[puiterwijk]

I think this is too late for the Kerckhoffs Pilot phase (which is still marked as the milestone for this issue), as the Kerckhoffs Pilot cards are "out in the wild now"?