fix(python/django): FileSystemStorage call (#421) #1387

Job	Run time
build (javascript/express)	2m 12s
build (javascript/hapi)	16s
build (javascript/lang)	3m 19s
build (javascript/node)	14s
build (javascript/react)	28s
build (javascript/third_parties)	1m 56s
build (ruby/lang)	4m 11s
build (ruby/rails)	1m 41s
build (ruby/third_parties)	3m 31s
build (java/lang)	3m 6s
build (java/spring)	16s
build (java/android)	20s
build (java/third_parties)	29s
build (php/lang)	5m 0s
build (php/symfony)	55s
build (php/third_parties)	1m 4s
build (python/django)	29s
build (python/lang)	1m 7s
build (python/third_parties)	12s
build (go/lang)	58s
build (go/gosec)	2m 6s
build (go/gorilla)	23s
build (go/third_parties)	48s
	35m 1s

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