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update debug, and benchmark from phase3

-Now the demos are built with the openvino_model_zoo repo fork
-Phase2 is within phase1
-phase3 is moved to phase2
-phase3 is the bulidng repo block
-execute mode for scripts is changed

update directory under debug

Update to run with R3.376, path dir update and images name update

Update doc to 2019 R2 release

-Phase1: update directories, python 3.6 installed
-Phase2: update directories
-Phase3: update downloads and optimizers
-demo: update entrypoint.sh and runcmd.sh