Do not fail the install_puppet.sh on 2th run

The pip-python symbolic link creation is the last
step in the install_puppet.sh on Fedora.
If the symbolic link already exists,
the exit status of the script will be failed.

After this change the pip-python link will be created by force,
so it will not fail on second run, and it may correct an old incorrect
link.

Change-Id: I0b25b1d69ee5e851f15e44fd16f62c29676d2075
Merge "Do not fail the install_puppet.sh on 2th run"