build, commit: allow removing default identity labels using --identity-labels=false

[flouthoc]

Allow end users to remove default identity labels if they want to.
Since there are instances where images can be reproduced across version
hence users must have option to suppress default labels.

Closes: #3826

[openshift-ci]

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[rhatdan]

Could you change the option to --identify-labels with a default value of true.

Then user could type --identify-labels=false. Shorter to type.
Or perhaps --idlabels=false.

[flouthoc]

@rhatdan Would using default true cause problem for cases where podman remote / API or other tools which directly call buildah and initialize option in structs, we will have to instrument all such occurrences of code to set default true however as of now they will just not set the field and it will remain false.

[rhatdan]

In the remote protocol, it should be an optional bool and only set when the user sets it. Otherwise it defaults to true.

[flouthoc]

@nalind @rhatdan PTAL

[flouthoc]

@rhatdan @TomSweeneyRedHat @nalind PTAL

[rhatdan]

LGTM

[flouthoc]

@nalind @TomSweeneyRedHat PTAL

[rhatdan]

@giuseppe @vrothberg @saschagrunert PTAL

[vrothberg]

/lgtm