get rid of flask tutorials (#3403) #4571

Job	Run time
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	16m 43s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	23m 18s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	16m 35s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	22m 21s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	39m 57s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	35m 56s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	17m 29s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	31m 47s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	35m 26s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	17m 8s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	24m 59s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	17m 36s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	24m 28s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	17m 15s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	19m 51s
pytorch_tutorial_build_manager	23m 27s
	6h 24m 16s

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