Sync latest version of protocol tests

[jeskew]

This PR also adds support for a recent addition to the protocol (jsonvalue flags on headers).

/cc @chrisradek

[codecov-io]

Codecov Report

Merging #1407 into master will increase coverage by 4.32%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1407      +/-   ##
==========================================
+ Coverage   90.85%   95.18%   +4.32%     
==========================================
  Files         173      174       +1     
  Lines        6113     6124      +11     
  Branches     1249     1250       +1     
==========================================
+ Hits         5554     5829     +275     
+ Misses        559      295     -264

Impacted Files	Coverage Δ
lib/param_validator.js	97.1% <100%> (+0.06%)	✅
lib/protocol/rest.js	100% <100%> (ø)	✅
lib/model/shape.js	94.3% <100%> (+0.05%)	✅
index.js	100% <0%> (ø)
lib/services/iotdata.js	30.76% <0%> (+15.38%)	✅
clients/cloudsearch.js	76.47% <0%> (+23.52%)	✅
clients/lambda.js	76.47% <0%> (+23.52%)	✅
clients/iotdata.js	100% <0%> (+25%)	✅
clients/pinpoint.js	100% <0%> (+27.27%)	✅
clients/servicecatalog.js	100% <0%> (+27.27%)	✅
... and 64 more

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[chrisradek]

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