chroot: create /home/user/bin directory by default

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
bb.org: lxterminal doesnt add ~/bin via .profile so add it via .bashrc

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
cleanup: chroot_generic_startup_scripts -> rfs_startup_scripts conversion

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
cleanup: seperate rfs_startup_scripts from rfs_startup_scripts_rcnee from git clone of https://github.com/RobertCNelson/boot-scripts

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
bb.org: have lxterminal exec loginshell/bash

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>