Fixed dockerfiles

[Ciroye]

Upload bootstrap version to https://bootstrap.pypa.io/pip/3.6/get-pip.py and security problem with "git config --global url."https://".insteadOf git://"

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[ktirumalafb]

@Ciroye , thanks for submitting the PR! I'm a bit confused, because it seems like you just deleted the Dockerfiles instead of modified them (the diff only seems to say that Dockerfile.cuda and Dockerfile.dev were deleted) - was that intended?

[Ciroye]

Sorry, I forgot to upload the docker with the new changes @ktirumalafb, could you please review it again, please?