ID views: ignore searches for views outside the subtrees of schema-compat sets

schema-compat plugin may provide multiple disjoint subtrees which
can be used to request overridden entries by prefixing the subtree
suffix with a

  cn=<name of view>,cn=views,<subtree suffix>

As subtrees may be disjoint, we cannot rely on the common suffix. Thus,
any attempt to replace target DN and update filter terms must only be
done once we are sure the search will be done in the subtree.

This optimization prevents mistakenly changing the search filter when
FreeIPA and SSSD search for the ID overrides themselves, as the same
structure of the target DN is used for  cn=views,cn=accounts,$SUFFIX
subtree in FreeIPA. This subtree is never handled by slapi-nis and
should be ignored.

https://bugzilla.redhat.com/show_bug.cgi?id=1157989

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