ImageContentSourcePolicy: add icsp shortname

[Frankkkkk]

Hi,
A nice shortname to have, as typing the fullname is a bit long.. ;-)

Fixes #622

thanks and cheers!
Frank

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[openshift-ci]

Hello @Frankkkkk! Some important instructions when contributing to openshift/api:
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[openshift-ci]

Hi @Frankkkkk. Thanks for your PR.

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[JoelSpeed]

How many people are expected to interact with ImageContentSourcePolicy and how often? IIUC, this would be just the cluster admin (as opposed to general workload admins) and infrequently?

[Frankkkkk]

yep