Inline bosh_encryption into bosh-core

The former is not architecturally signifcant and the cli already has transitive native dependencies

[#55121230]

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>
Make rubocop happy with code that came from bosh_encryption

Signed-off-by: Brian Cunnie <cunnie@pivotallabs.com>