[khmer] is_pair sensitive to order

[Keith Robison]

Probably few people would see this as a bug, but is_pair in utils.py (and
by extension, interleave_pairs.py) is sensitive to the order the two
sequences are given in  -- if you give sequences (FASTQ files for
interleave_pairs.py) in the order R2, R1, the function will say they are
not paired
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