feat(entropy): Remove entropy check and MINIMUM option and just seed urandom

[RossRichardson]

Starting October 3, 2022, Lambda will roll out an update to the underlying Linux kernel, patching it to 4.14.285. This update includes a change to how entropy collection is implemented, resulting in /proc/sys/kernel/random/entropy_avail reporting 256 instead of higher values.

This can impact libraries like Bless so by October 3, 2022 we will need to;

• Update ENTROPY_MINIMUM_BITS_DEFAULT in the bless_config.py file to 256.
• If using Bless options, also update entropy_minimum_bits to 256.

Approach:
Add in more entropy to dev/urandom using the RANDOM_SEED_BYTES_OPTION and ignore the available entropy all together. Remove the ENTROPY_MINIMUM_BITS_DEFAULT option and change the entropy check to a seed_entropy method.