feat(python): os command injection (CWE-78) #1281

Job	Run time
build (javascript/express)	2m 7s
build (javascript/hapi)	17s
build (javascript/lang)	3m 23s
build (javascript/node)	17s
build (javascript/react)	27s
build (javascript/third_parties)	1m 55s
build (ruby/lang)	4m 10s
build (ruby/rails)	1m 39s
build (ruby/third_parties)	3m 25s
build (java/lang)	3m 0s
build (java/spring)	20s
build (java/android)	18s
build (java/third_parties)	30s
build (php/lang)	4m 58s
build (php/symfony)	58s
build (php/third_parties)	1m 6s
build (python/lang)	36s
build (go/lang)	57s
build (go/gosec)	2m 6s
build (go/gorilla)	14s
build (go/third_parties)	39s
	33m 22s

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