pydata / xarray / 3012

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Fixes open_mfdataset too many open file error (#1198)

Includes testing to demonstrate an OSError associated
with opening too many files as encountered
using open_mfdataset.

Fixed for the following backends:
 * netCDF4 backend
 * scipy backend
 * pynio backend

Open/close operations on h5netcdf appear to have an
error associated with the h5netcdf library following
correspondence with @shoyer.
Thus, there are still challenges with h5netcdf;
hence, support for h5netcdf is currently disabled.

Note, by default `autoclose=False` for open_mfdataset so standard
behavior is unchanged unless `autoclose=True`.

This choice of default is to select standard xarray performance over
general removal of the OSError associated with opening too many files as
encountered using open_mfdataset.

370 of 370 new or added lines in 10 files covered. (100.0%)

12296 of 16159 relevant lines covered (76.09%)

0.76 hits per line