Add PreallocatedMode for predetermined GUID lookup#20

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ttalati/tcl-6978-modify-ufm-to-support-using-a-hash-to-lookup-the-pretogethercomputer/ib-kubernetes:ttalati/tcl-6978-modify-ufm-to-support-using-a-hash-to-lookup-the-preCopy head branch name to clipboard