add image policy documentation

[deads2k]

Adds documentation explaining how to use and test the ImagePolicy admission plugin.

@simon3z fyi
@smarterclayton beta or tech preview? What's the distinction again?

[simon3z]

cc @moolitayer

[moolitayer]

It allows you to control? (otherwise 1. below does not read well)

[moolitayer]

@simon3z I will create a ManageIQ upstream doc linking here.

[simon3z]

@simon3z I will create a ManageIQ upstream doc linking here.

@moolitayer I suppose this will be published somewhere in https://docs.openshift.com/enterprise/latest/welcome/index.html
cc @deads2k

[deads2k]

@adellape Is there a tag I should use for 3.3 items? I've got a few.

[moolitayer]

the plugin the above

[deads2k]

Comments addressed.

@moolitayer @simon3z take note. We changed the API slightly since 3.3 had not shipped. I've updated the examples to match.

[deads2k]

@ahardin-rh another for 1.3/3.3

[ahardin-rh]

s/admission plugin/Admission Plug-in

[ahardin-rh]

Suggest rewording:
For example, use the information above, then test like this:

[ahardin-rh]

@deads2k Thanks! A few comments from me.

Should this be included in Dedicated as well? If so, I will adjust my labels accordingly. Thanks again!

[deads2k]

Should this be included in Dedicated as well? If so, I will adjust my labels accordingly. Thanks again!

No, it shouldn't, though it does raise an interesting question about whether and how someone in dedicated would want to control this. @smarterclayton something for us to consider.

[deads2k]

Comments addressed.

[ahardin-rh]

@deads2k Thanks! Can you please give it a squash? 🙇

[deads2k]

@deads2k Thanks! Can you please give it a squash?

done

[ahardin-rh]

[rev_history]
|xref:../admin_guide/image_policy.adoc#admin-guide-image-policy[Image Policy]
|New topic about controlling which images are allowed to run on your cluster using the ImagePolicy admission plug-in.
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