Use karma's dots reporter instead of progress for travis log

[dsmilkov]

DEV Using dots reporter in Travis cleans up the log (see this PR's log) and makes it easier to see the failed tests. Also switch BrowserStack tests to High Sierra (10.3.x)

Also since karma 3.x, the tests run in randomized order. This caused some tests to look flaky (e.g. some local storage tests were changing a global state and not resetting it properly). I'm reverting the order of tests to a non-random behavior by adding the following to karma.conf.js

client: {
  ...,
  jasmine: {random: false}
}

We should do the same in other repos.

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This change is 

[manrajgrover]

LGTM! 💯 It was difficult to check failed tests on Travis and this fixes it! Thank you!

[nsthorat]

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Review status: 0 of 2 files reviewed at latest revision, all discussions resolved, some commit checks failed.

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