python readline 6.0 portability fix

readline-6-workaround.py

# readline 6.0 emits unexpected escape characters
# in rl_initialize() if TERM=xterm (and some variants).
# The python readline module calls rl_initialize() at
# module import, which triggers the issue.
# RHEL/CentOS 6.x uses readline 6.0.
# Workaround the issue by changing the TERM type if
# it starts with "xterm" before any module import.
#
# @see http://bugs.python.org/issue19884

import os
if os.environ.get('TERM', '').startswith('xterm'):
    os.environ['TERM'] = 'vt100'