Improve hexdump output of shell_hexdump() to match what is currently
printed by LOG_HEXDUMP*() family of functions. That way string buffers
that are sent/received using shell commands can be easily presented
using shell_hexdump() without loosing user experience (with previous
shell_hexdump() that printed only hex bytes) and code validity (printed
buffers are not always NULL terminated with only printable characters).
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
6fdb9e6ded