1.10.x: properly handle the case where the secondary initializes after the primary #11539
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Backport of #11514
Fixes #11367
Previously
secondaryInitialize
would return nil in this case, which prevented thedeferred initialize from happening, and left the CA in an uninitialized state until a config
update or root rotation.
To fix this I extracted the common parts into the delegate implementation. However looking at this
again, it seems like the handling in secondaryUpdateRoots is impossible, because that function
should never be called before the secondary is initialzied. I beleive we can remove some of that
logic in a follow up.