Add KMS IT test and kokoro configs.

[kolea2]

No description provided.

[codecov]

Codecov Report

Merging #4517 into master will decrease coverage by 0.63%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #4517 +/- ##
============================================
- Coverage 49.16% 48.52% -0.64% + Complexity 21929 20734 -1195 
============================================
Files 2077 2077 Lines 207074 202981 -4093 Branches 24097 23292 -805 ============================================
- Hits 101801 98490 -3311 + Misses 97100 96416 -684 + Partials 8173 8075 -98

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/logging/MonitoredResourceUtil.java	41.66% <0%> (-9.26%)	5% <0%> (-3%)
.../java/com/google/cloud/testing/CommandWrapper.java	87.87% <0%> (-9.1%)	13% <0%> (ø)
.../cloud/datastore/testing/LocalDatastoreHelper.java	80% <0%> (-4.62%)	14% <0%> (ø)
...in/java/com/google/cloud/storage/StorageBatch.java	88% <0%> (-4%)	13% <0%> (ø)
...m/google/cloud/vision/v1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p3beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p2beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
.../java/com/google/cloud/speech/v1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...om/google/cloud/speech/v1p1beta1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...ogle/cloud/texttospeech/v1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
... and 485 more

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