Add nosec in get_free_segmentation_id function

pep8 job fails due to bandit check with an error:
    [B311:blacklist] Standard pseudo-random generators are not suitable 
    for security/cryptographic purposes.

But using the standard random function in the get_free_segmentation_id 
function is suitable, so adding #nosec comment should unbblock the gate.

Change-Id: Iad8e376c503a32300b3e0b504f47a0c81e53a7a8
1 file changed