add a failing test case for calling dht put with a bad key
add a failing test case for calling dht put with a bad key

see #5113

License: MIT
Signed-off-by: Steven Allen <4068f0880b399410602d694b3cc711c8a8f4727e@stebalien.com>

Luzifer/go-ipfs,chriscool/go-ipfs,ianopolous/go-ipfs,chriscool/go-ipfs,ianopolous/go-ipfs,Luzifer/go-ipfs,Luzifer/go-ipfs,chriscool/go-ipfs,ianopolous/go-ipfs