CSIT fix to use correct lib

- Explicitly setting pylibs.txt file to use 3.0.0 version of
  robotframework-selenium2library
- Also updating the script to be read from WORKSPACE.

Change-Id: Ic66c5357f53e73678aac439d095d318dbd03c333
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
2 files changed