Make cas/expiry parsing more tolerant of false-ish values
Make cas/expiry parsing more tolerant of false-ish values

Change-Id: I8b4779e50ba6e06a2c62892fe1f58f44288da7be
Reviewed-on: http://review.couchbase.org/19718
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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