Remove unwanted imports in an sdssrefcat config file

tests/data/sdssrefcat/config/IngestIndexedReferenceTask.py
was stuffed with unwanted imports, including at least one
private astropy file. I removed all of the unneeded imports.

tests/data/sdssrefcat/config/IngestIndexedReferenceTask.py

@@ -1,101 +1,6 @@
 import lsst.meas.algorithms.ingestIndexReferenceTask
 assert type(config)==lsst.meas.algorithms.ingestIndexReferenceTask.IngestIndexedReferenceConfig, 'config is of type %s.%s instead of lsst.meas.algorithms.ingestIndexReferenceTask.IngestIndexedReferenceConfig' % (type(config).__module__, type(config).__name__)
-import astropy.utils.xml.validate
-import astropy._erfa.core
-import astropy.io.fits.card
-import astropy.table
-import astropy.io.fits.py3compat
-import astropy.io.fits.column
-import astropy.io.votable.table
-import astropy.table.np_utils
-import astropy.io.fits.hdu.compressed
-import astropy.io.fits.diff
-import astropy.time.formats
-import astropy.io.fits
-import astropy.io.ascii.misc
-import astropy.io.votable.exceptions
-import astropy.io.ascii.connect
-import astropy.io.fits.hdu.groups
-import astropy.table.table
-import numpy.lib.recfunctions
-import astropy.utils.compat.numpy.lib
-import astropy.time.utils
-import astropy.io.ascii.core
-import astropy.time.core
-import astropy.io.fits.verify
-import astropy.io.ascii.basic
-import astropy.io.fits._numpy_hacks
-import astropy.io.ascii.daophot
-import astropy.io.ascii.ecsv
-import astropy.io.ascii.fixedwidth
-import astropy.utils.xml.writer
-import astropy.io.ascii.html
-import astropy.io.ascii.ui
-import astropy.table.operations
-import astropy.utils.xml._iterparser
-import astropy.io.fits.file
-import astropy.utils.compat.gzip
-import astropy.io.misc.pickle_helpers
-import astropy.io.votable
-import astropy.io.fits.header
-import astropy.table.info
-import astropy.io.fits.hdu.streaming
-import astropy.io.misc.hdf5
-import astropy.io.fits.hdu.hdulist
-import astropy.io.votable.converters
-import astropy.utils.collections
-import lsst.meas.algorithms.readFitsCatalogTask
-import astropy.table.meta
-import astropy._erfa
-import astropy.time.erfa_time
-import astropy.io.fits.compression
-import astropy.io.votable.connect
-import astropy.io.votable.ucd
-import astropy.io.misc
-import astropy.io.fits.fitsrec
-import astropy.utils.data
-import astropy.io.fits.connect
-import astropy.io.misc.connect
-import astropy.io.fits.hdu.base
-import astropy.table.pprint
-import astropy.table.row
-import astropy.io.fits.hdu.nonstandard
-import astropy.utils.compat.numpy.lib.stride_tricks
-import astropy.io.votable.tablewriter
-import astropy.io.ascii.ipac
-import astropy.utils.xml
-import astropy.utils.xml.iterparser
-import astropy.io.ascii.latex
-import astropy.io.registry
-import astropy.io.ascii
-import astropy.io
-import astropy.io.ascii.cparser
-import astropy.table._np_utils
-import astropy.io.fits.util
-import backports_abc
-import astropy.table.column
-import astropy.table._column_mixins
-import astropy.utils.compat.numpy
-import astropy.io.fits.hdu.table
-import astropy.table.sorted_array
-import astropy.utils.xml.check
-import astropy.io.fits.convenience
-import astropy.io.ascii.cds
-import astropy.io.ascii.fastbasic
-import numpy.ma.mrecords
-import astropy.table.groups
-import astropy.time
-import astropy.io.fits.hdu
-import astropy.io.fits.hdu.image
-import astropy.utils.metadata
-import astropy._erfa._core
-import astropy.io.ascii.sextractor
-import astropy.table.index
-import astropy.io.votable.tree
-import astropy.io.votable.xmlutil
-import astropy.io.votable.util
-import astropy.table.jsviewer
-import astropy.table.bst
+
 # Name of column stating if satisfactory for photometric calibration (optional).
 config.is_photometric_name='photometric'