Suomi NPP Chooser fix

The test which ensures granules for any single selection are contiguous (consecutive) was failing for the odd case when a single granule spans days.  Example file:

SVDNB_npp_d20121224_t2359027_e0000250_b06010_c20121225062527967541_noaa_ops.h5

Note how start time t2359 and end time e0000 span days.