feat(python): os command injection (CWE-78) #1297

Job	Run time
build (javascript/express)	2m 9s
build (javascript/hapi)	14s
build (javascript/lang)	3m 21s
build (javascript/node)	14s
build (javascript/react)	24s
build (javascript/third_parties)	2m 2s
build (ruby/lang)	4m 11s
build (ruby/rails)	1m 40s
build (ruby/third_parties)	3m 25s
build (java/lang)	3m 0s
build (java/spring)	16s
build (java/android)	15s
build (java/third_parties)	34s
build (php/lang)	5m 10s
build (php/symfony)	58s
build (php/third_parties)	1m 6s
build (python/lang)	37s
build (go/lang)	1m 2s
build (go/gosec)	2m 11s
build (go/gorilla)	19s
build (go/third_parties)	39s
	33m 47s

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