Expanded 0-RTT testing, assorted fixes

[Ralith]

This tests the behavior tonight's rustls fixes corrected.

[Ralith]

Travis failure looks spurious.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@ec794de). Click here to learn what that means.
The diff coverage is 74.07%.

@@            Coverage Diff            @@
##             master     #194   +/-   ##
=========================================
  Coverage          ?   74.07%           
=========================================
  Files             ?       23           
  Lines             ?     5864           
  Branches          ?        0           
=========================================
  Hits              ?     4344           
  Misses            ?     1520           
  Partials          ?        0

Impacted Files	Coverage Δ
quinn-proto/src/endpoint.rs	76.86% <ø> (ø)
quinn-proto/src/stream.rs	88.1% <100%> (ø)
quinn-proto/src/connection.rs	72.7% <38.09%> (ø)
quinn-proto/src/tests.rs	91.08% <96.77%> (ø)

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[codecov]

Codecov Report

Merging #194 into master will increase coverage by 3.84%.
The diff coverage is 76.78%.

@@            Coverage Diff             @@
##           master     #194      +/-   ##
==========================================
+ Coverage   73.85%   77.69%   +3.84%     
==========================================
  Files          23       23              
  Lines        5813     6744     +931     
==========================================
+ Hits         4293     5240     +947     
+ Misses       1520     1504      -16

Impacted Files	Coverage Δ
quinn-proto/src/endpoint.rs	81.69% <ø> (+4.38%)	⬆️
quinn-proto/src/stream.rs	88.1% <100%> (+0.1%)	⬆️
quinn-proto/src/connection.rs	78.99% <47.82%> (+7.01%)	⬆️
quinn-proto/src/tests.rs	91.08% <96.77%> (+0.3%)	⬆️
quinn-proto/src/lib.rs	50% <0%> (+2.08%)	⬆️
quinn-proto/src/packet.rs	88.41% <0%> (+6.45%)	⬆️

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[Ralith]

Tweaked the read_tls condition.