Add test to make sure all clients can be instantiated

[jeskew]

We don't have a test to make sure all clients can be instantiated, so this test adds one.

/cc @chrisradek

[codecov-io]

Codecov Report

Merging #1411 into master will increase coverage by 4.31%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1411      +/-   ##
==========================================
+ Coverage   90.85%   95.17%   +4.31%     
==========================================
  Files         173      174       +1     
  Lines        6113     6114       +1     
  Branches     1249     1249              
==========================================
+ Hits         5554     5819     +265     
+ Misses        559      295     -264

Impacted Files	Coverage Δ
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/lightsail.js	100% <0%> (+27.27%)	✅
clients/mobileanalytics.js	100% <0%> (+27.27%)	✅
clients/cloudhsm.js	100% <0%> (+27.27%)	✅
clients/discovery.js	100% <0%> (+27.27%)	✅
clients/cognitoidentityserviceprovider.js	100% <0%> (+27.27%)	✅
... and 61 more

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[chrisradek]

[lock]

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