appinfo: delegate to cleaned openAttrs
Revert "complete wildcard verification on annotation sub-elements"

This reverts commit 00d2dd6eb177a3c972787e36a7332901410358ee.

The change was completely wrong; there is no restriction on attributes
in wildcard content under documentation or appinfo (covered by
anyContent), only on the documentation or appinfo elements themselves.
Discovered attempting to correct the broken fix which incorrectly
allowed attributes with absent namespaces in a ##other wildcard.