uses os.urandom instead of Crypto.Random for backward compatibility
uses os.urandom instead of Crypto.Random for backward compatibility

Crypto.Random has been introduced by pycrypto 2.1 but in RHEL6 and
derivates you will only find pycrypto 2.0.1

bug #1186022

Change-Id: Ib601981b0b8fcb5b3e8fc8761ee05adf7f6574fa

Triv90/Heat,Triv90/Heat,Triv90/Heat