busybox: Add package with menuconfig, pre-r39106

OpenWrt r39106 removed Busybox' configuration submenu from "make menuconfig".
This package is a fork of busybox r39105, 1 revision before that removal happened.

https://dev.openwrt.org/changeset/39106
debootstrap: Remove package

Notes:
The OpenWrt package was updated, so this package is no longer necessary.
busybox: Add changes of r39107
dovecot: Update to v2.2.10
tgt: Update
busybox: Update paths

Notes:
Replaced "package/utils/busybox" with "package/feeds/bootrepo/busybox",
so this repository can be used after manually removing busybox from package/utils.