Disabling schema checking in slapadd

[Luke Howard <lukeh@PADL.COM>]

I'd like to add an -S flag (or somesuch) to slapadd to disable schema
checking. We have an application that disables checking for certain
operations (such as writing tombstones which are stripped of most
attributes). For data recovery we'd like slapcat/slapadd to work.

Thoughts?

-- Luke

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