test: don't use foo-bar.net in TestHTTPClientMakeHTTPDialer

[wetcod]

Description

CI fails because of test relied on connecting to the external site.
So cherry-pick tendermint/tendermint#5997

And increase the test_cover timeout

---

For contributor use:

• Wrote tests
• Updated CHANGELOG_PENDING.md
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/) and code comments
• Re-reviewed Files changed in the Github PR explorer

[codecov]

Codecov Report

Merging #174 (02645eb) into develop (a01efd2) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #174      +/-   ##
===========================================
- Coverage    62.52%   62.43%   -0.09%     
===========================================
  Files          283      283              
  Lines        26475    26480       +5     
===========================================
- Hits         16554    16534      -20     
- Misses        8576     8598      +22     
- Partials      1345     1348       +3     

Impacted Files	Coverage Δ
lite2/trust_options.go	18.18% <0.00%> (-15.16%)	⬇️
types/tx.go	86.95% <0.00%> (-4.35%)	⬇️
blockchain/v2/reactor.go	35.92% <0.00%> (-2.97%)	⬇️
abci/client/socket_client.go	48.19% <0.00%> (-1.36%)	⬇️
consensus/state.go	77.10% <0.00%> (-0.92%)	⬇️
blockchain/v0/pool.go	78.02% <0.00%> (-0.64%)	⬇️
consensus/reactor.go	79.63% <0.00%> (-0.12%)	⬇️
p2p/pex/pex_reactor.go	83.33% <0.00%> (+0.55%)	⬆️
consensus/replay.go	71.42% <0.00%> (+0.77%)	⬆️
consensus/ticker.go	95.83% <0.00%> (+4.16%)	⬆️

[torao]

LGTM

[Kynea0b]

What does this value Hi!\n mean ?
https://github.com/line/tendermint/pull/174/files#diff-2b6e7e0353cdd8f2400baf409cc0206c48d2ac16dbfd68457cead476444123efR15

[wetcod]

What does this value Hi!\n mean ?

This is cherry-picked PR, so I don't know exactly what the original author meant.
But it looks like sample bytes.