Adding a validation method to XTFConfig to check that build and master namespace don't collide

[fabiobrz]

Adding a validation method to XTFConfig, which is called by a static block in order to check that build and master namespace don't collide since this might cause leftover resources to be found by OpenShift::clean()

Fix #536 - alternative to #537

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[simkam]

I'm not sure whether we should only print a warning. I guess in some cases it might work without issues even when namespace is the same.

[mnovak1]

@fabiobrz AFACT we allow to set build namespace to master namespace. For example we use it for CVP testing. Thus we'll need to solve all issues instead.

[fabiobrz]

Thanks @simkam, indeed it would work in some cases, while it would not in others, as the one I described in the PR description and here

Thanks @mnovak1 - I'll put this one back to draft, then.

[mnovak1]

@fabiobrz I'll close this PR as we'll need to resolve issues with the same build and master namespaces instead of trying to avoid it.