The line

            sage: os.environ['SAGE_PEXPECT_LOG'] = "1"

which appears twice in sage/doctest/forker.py turns on logging for pexpect, and this results in two files being created in DOT_SAGE/pexpect_logs every time you doctest this file.

Doctests pass after deleting these lines, so let's remove those lines.

CC: @mkoeppe

Component: doctest framework

Author: John Palmieri

Branch/Commit: 543b665

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/34416