* Salt minion is unable unencrypt the messages from master during boot
    because of lack of entropy, throwing the exception:

    File "/usr/lib/python2.7/dist-packages/salt/utils/rsax931.py", line 146, in sign
    raise SSLError('Unable to encrypt message')
    SSLError: Unable to encrypt message:
    error:80064191:lib(128):osrandom_init:getrandom() initialization failed with EAGAIN. Most likely Kernel CPRNG is not se
    error:80065190:lib(128):osrandom_rand_bytes:getrandom() initialization failed.
    error:04088003:rsa routines:RSA_setup_blinding:BN lib
    error:04066044:rsa routines:RSA_EAY_PRIVATE_ENCRYPT:internal error

    After node has been booted up, and /dev/random device collected some
    extra entropy, salt-minion could start.

    This patch configures libvirt vms to use /dev/urandom for faster
    entropy regeneration

Change-Id: I470166b4424752d24ac4bb2cb87d9f99cd14752e
Co-Authored-By: Oleksandr Savatieiev <osavatieiev@mirantis.com>
Prod-Related: PROD-19711