exclude _sslgte279.py from pep8 and pyflakes

.pep8

 [pep8]
 ignore=E702,E265,E402,E731,E266
 max_line_length=160
-exclude=.git,build,2.6,2.7,2.7pypy,3.3,test_support.py,test_queue.py,patched_tests_setup.py,test_threading_2.py,lock_tests.py
+exclude=.git,build,2.6,2.7,2.7pypy,3.3,test_support.py,test_queue.py,patched_tests_setup.py,test_threading_2.py,lock_tests.py,_sslgte279.py

util/pyflakes.py

@@ -26,6 +26,7 @@ greentest/test__queue.py:\d+: undefined name 'GenericGetTestCase'
 greentest/test__server_pywsgi.py:
 gevent/core.py:\d+: 'from gevent.corecffi import *' used; unable to detect undefined names
 gevent/core.py:\d+: 'from gevent.corecext import *' used; unable to detect undefined names
+gevent/_sslgte279.py:.*
 '''
 
 IGNORED = IGNORED.strip().replace(' *', ' \\*').split('\n')