distro: add update_user_encpassword().
distro: use update_user_password instead of chpasswd command.
distro: add "rootencpass" option.
distro: add "devel_encpass" option.
distro: add "devel_encpass" option.
Merge branch 'feature-set-encpass'
Merge pull request #24 from hansode/master

new options to set encrypted password