pipe lookup plugin uses Popen with shell=True intentionally.
This is considered a security issue if user input is not validated.
Updated docs to reflect this information for the user. Also, added
Bandit B602 documentation link for further reading.
Fixes: #70159
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>
(cherry picked from commit e5649ca3e8)
