Merge pull request #1216 from practicalswift/add-files-without-py-suffix-to-dot-pep8

[Python] Update list of Python files without .py suffix in .pep8 file.

Author: jrose-apple

.pep8

@@ -1,3 +1,3 @@
 [flake8]
-filename = *.py,build-script,gyb,line-directive,ns-html2rst,pre-commit-benchmark,recursive-lipo,submit-benchmark-results,update-checkout,viewcfg
+filename = *.py,Benchmark_Driver,Benchmark_DTrace.in,Benchmark_GuardMalloc.in,Benchmark_RuntimeLeaksRunner.in,build-script,gyb,line-directive,ns-html2rst,recursive-lipo,submit-benchmark-results,update-checkout,viewcfg
 ignore = E101,E111,E128,E265,E302,E402,E501,W191