Feature 10296 Pip Standardization

Cleanup of Dockerfile
Moved requirements from devops/docker/tests/Dockerfile into this 
module so they are visible.

Added pylint and safety hooks.
Added place for unit tests, but none are written yet, so does not
run them.

Change-Id: I75ce40c558bd9bc8975269dca681ba84678e6de6
Signed-off-by: beierlm <mark.beierl@canonical.com>