Fixing RO Security Vulnerabilities

Jinja2 sets autoescape to False, disabling SSL certificate checks, use of unsafe yaml load,
Try-Except-Pass detected, use of assert detected.
Removing openmanoconfig.py.

Change-Id: I3353208e150ae6c2f91befa1a3bbed33ed0c528d
Signed-off-by: aticig <gulsum.atici@canonical.com>