Use /dev/zero instead of /dev/random when initializing encrypted disks.
Revert "Use /dev/zero instead of /dev/random when initializing encrypted disks."

This reverts commit 0ef8913f1bae96af811edb6c48c554bc4d342607.

This does more harm than good.

Ticket: #3804
reverse method quotes arguments in django 1.6
setup_environ is no longer available in django 1.6

Script forgotten in 25faafaf777