Update stsci.tools setup.cfg to turn off use_2to3.
Update stsci.tools setup.cfg to turn off use_2to3.


git-svn-id: b2984d01ce7493eb058c47b650af6e49d7ab5102@46311 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools