list-sellers hangs, no debug information available
**Describe the bug**
Unable to list sellers at any rendezvous point: the software either hangs or returns an empty list.

- It hangs when I provide it something it can start out on. Example: /dnsaddr/rendezvous.coblox.tech/p2p/12D3KooWQUt9DkNZxEn2R5ymJzWj15MpG6mTW84kyd8vDaRZi46o

- It displays an empty list if I provide it an incorrect rendezvous point on purpose.

- It displays an empty list if I provide it a bad ID in the rendezvous point, no errors or warnings (this could be by design, but it doesn't help debug issues)

- The only outputs I could get out of it were: 1) an empty list 2) no output at all, just the software hanging until I ctrl+c.

Example of commands tried and their outputs

> ./swap --debug --testnet list-sellers --rendezvous-point /dnsaddr/rendezvous.coblox.tech/p2p/12D3KooWQUt9DkNZxEn2R5ymJzWj15MpG6mTW84kyd8vDaRZi46o

-> Result: hangs, doesn't display anything, doesn't create any logfiles - if TOR is used and I watch the socks5 traffic, I can see it communicating for a while, but then stopping

> ./swap --debug list-sellers --rendezvous-point /dnsaddr/rendezvous.coblox.tech/p2p/12D3KooWQUt9DkNZxEn2R5ymJzWj15MpG6mTW84kyd8vDaRZi46o

-> Result: hangs, doesn't display anything, doesn't create any logfiles - if TOR is used and I watch the socks5 traffic, I can see it communicating for a while, but then stopping

> ./swap --debug list-sellers --rendezvous-point /ip4/1.2.3.4/tcp/9939 /p2p/12D3KooWAPci3x4GuWDi9P86efnR1q9a7phKnPwnwQcRNMW2HDUy
(incorrect IP on purpose)

-> Result: waits around for ~10 seconds, then displays this:
+-------+--------------+--------------+--------+---------+
| PRICE | MIN_QUANTITY | MAX_QUANTITY | STATUS | ADDRESS |
+========================================================+
+-------+--------------+--------------+--------+---------+

> ./swap --debug list-sellers --rendezvous-point /dnsaddr/battery.commitcri.me/p2p/A_BAD_ID

-> Result: returns instantly this empty list again:
+-------+--------------+--------------+--------+---------+
| PRICE | MIN_QUANTITY | MAX_QUANTITY | STATUS | ADDRESS |
+========================================================+
+-------+--------------+--------------+--------+---------+

> ./swap list-sellers --rendezvous-point /dns4/rendezvous.xmr.radio/tcp/8888/p2p/12D3KooWN3n2MioS515ek6LoUBNwFKxtG2ribRpFkVwJufSr7ro7

+-------+--------------+--------------+--------+---------+
| PRICE | MIN_QUANTITY | MAX_QUANTITY | STATUS | ADDRESS |
+========================================================+
+-------+--------------+--------------+--------+---------+

> ./swap list-sellers --rendezvous-point /dns4/eratosthen.es/tcp/7798/p2p/12D3KooWAh7EXXa2ZyegzLGdjvj1W4G3EXrTGrf6trraoT1MEobs

+-------+--------------+--------------+--------+---------+
| PRICE | MIN_QUANTITY | MAX_QUANTITY | STATUS | ADDRESS |
+========================================================+
+-------+--------------+--------------+--------+---------+

> ./swap list-sellers --rendezvous-point /dnsaddr/discover.unstoppableswap.net/p2p/12D3KooWA6cnqJpVnreBVnoro8midDL9Lpzmg8oJPoAGi7YYaamE

+-------+--------------+--------------+--------+---------+
| PRICE | MIN_QUANTITY | MAX_QUANTITY | STATUS | ADDRESS |
+========================================================+
+-------+--------------+--------------+--------+---------+


It looks like when it can't do the first basic steps, it returns an empty list (rather than displaying a more specific error, which would be nice). When it is able to proceed, it gets stuck in the process somewhere.

This happens with or without TOR. Tried it without TOR, giving it full internet access and DNS. --debug doesn't offer any debug information. No debug files found in ~/.local/share/xmr-btc-swap/logs (only cli directory, contains mainnet/testneet, seed.pem).


**Lost/trapped Funds**
No

**Debug logs**
Unfortunately, none were created, despite using --debug.
$ ls -a .local/share/xmr-btc-swap/ .local/share/xmr-btc-swap/cli .local/share/xmr-btc-swap/cli/mainnet .local/share/xmr-btc-swap/cli/testnet
.local/share/xmr-btc-swap/:
.  ..  cli
.local/share/xmr-btc-swap/cli:
.  ..  mainnet  testnet
.local/share/xmr-btc-swap/cli/mainnet:
.  ..  seed.pem
.local/share/xmr-btc-swap/cli/testnet:
.  ..  seed.pem


**Platform (please complete the following information):**

- CLI, release binary
- 0.10.2
- Debian

I've also tried 3 different DNS servers, including 1.1.1.1.

Apologies in advance if I missed something basic in the docs. I would just love to get this working.
