[POC] make the docker registry secret always prime

[deads2k]

I think this makes the docker pull secrets always check every secret on startup.

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[deads2k]

@mfojtik this is the line you found before. Removing this causes us to rescan all secrets once and then only on changes thereafter, right?

[mfojtik]

@deads2k gotcha, this will cause e.getRegistryURLs to return empty map on the first run which will make https://github.com/openshift/origin/pull/19791/files#diff-f9db327ed89bae5fe5de02a82f7a91d8R244 pass.

[deads2k]

@mfojtik feel free to use this as a base if it makes sense to you.

/hold

don't want to merge this. I'm guessing @mfojtik will have opinions.

[openshift-ci-robot]

@deads2k: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/unit	3f5088e	link	/test unit

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