Updated install scripts to allow user defined virtualenv directory#37

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gayoso wants to merge 3 commits intomovidius:ncsdk2from

BigFiuBrother:ncsdk2

Commits on Nov 8, 2019

updated install scripts and conf to allow user input of virtualenv path
gayoso
committed
updated install and uninstall scripts to affect only virtualenv if option is enabled
gayoso
committed

Commits on Nov 28, 2019

allow 1804 install and change install defaults
gayoso
committed