busybox: update to 1.28.2

busybox: update to 1.28.2

Update busybox to 1.28.2, refresh patches and default config.

* modify 230-add_nslookup_lede.patch as opt_complementary was removed
    Also move nslookup_longopts variable declaration to be inside
    the same conditional as the function itself.
* modify 250-date-k-flag.patch to match upstream (opt_complementary)
* remove 600-cve-2017-16544.patch that is upstreamed

Notes about config changes:
* Some applet-specific LONG_OPTIONS config options were removed
* Config help text indentation changed, caused lots of
  text formatting changes for convert_menuconfig.pl
* convert_defaults.pl moved lots of defaults around, summary of
  actual changes below

New applets/features:
---------------------
ARCH
HEXEDIT
MINIPS
NETCAT
NUKE
RESUME
RUN_INIT
SETFATTR

New options:
------------
FEATURE_CATN
FEATURE_CROND_SPECIAL_TIMES
FEATURE_LIBBUSYBOX_STATIC
FEATURE_SETPRIV_CAPABILITIES
FEATURE_SETPRIV_CAPABILITY_NAMES
FEATURE_SETPRIV_DUMP
FEATURE_SH_READ_FRAC
FEATURE_SWAPONOFF_LABEL
FEATURE_VOLUMEID_MINIX
FEATURE_XARGS_SUPPORT_ARGS_FILE
FEATURE_XARGS_SUPPORT_PARALLEL
HUSH_GETOPTS
HUSH_READONLY
HUSH_TIMES

Removed:
--------
FEATURE_HAVE_RPC
MSH

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>