Unify password generation across FreeIPA
Also had to recalculate entropy of the passwords as originally,
probability of generating each character was 1/256, however the
default probability of each character in the ipa_generate_password
is 1/95 (1/94 for first and last character).
Reviewed-By: Martin Basti <email@example.com>
Reviewed-By: Petr Spacek <firstname.lastname@example.org>