Fix option errors in xreq, and improve test coverage.

[gdamore]

No description provided.

[codecov-io]

Codecov Report

Merging #133 into master will increase coverage by 2%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master     #133    +/-   ##
========================================
+ Coverage   62.01%   64.02%    +2%     
========================================
  Files          48       48            
  Lines        5550     5587    +37     
========================================
+ Hits         3442     3577   +135     
+ Misses       1851     1749   -102     
- Partials      257      261     +4

Impacted Files	Coverage Δ
protocol/xreq/xreq.go	91.93% <100%> (+47.97%)	⬆️
internal/test/options.go	100% <100%> (ø)	⬆️
transport/conn.go	71.42% <0%> (-1.59%)	⬇️
internal/test/closed.go	100% <0%> (ø)	⬆️
protocol/xrep/xrep.go	53.04% <0%> (+5.65%)	⬆️

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