Please review: Bug 559315 - Searching some attributes are now case sensitive when they were previously case-insensitive

[Rich Megginson]

In my testing, I found a few bugs in my previous patches:
slapi_matchingrule_is_compat() was not checking for NULL
the matching rule syntax plugin was registering with the INTEGER syntax oid
the bin_filter_ava() function needs to be ordering aware to implement 
the octetStringOrderingMatch
in default_mr_filter_create(), make sure the requested matching rule is 
provided by the given plugin

https://bugzilla.redhat.com/show_bug.cgi?id=559315

https://bugzilla.redhat.com/attachment.cgi?id=395827&action=diff

https://bugzilla.redhat.com/attachment.cgi?id=395827&action=edit