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* ./tests: Remove legacy coverage collection code The legacy tests/cover.test.bash script was not ./test script compatible for a long time. The following method of coverage collection works (also across packages) and does not make all the test execution slower. ``` COVERDIR=coverage PASSES="build build_cov cov" ./test go tool cover -html ./coverage/cover.out ``` * CI: Reduce duplicated coverage between different variants on Travis We used to execute unit tests in 3 different jobs, every time with --race detection and every time in 3 variants:1,2,4 CPUS. The proposed change makes each of the jobs use different variant of CPUS, and only 4-cpu variant is running with --race detection (as the more-parallel variant is more likely to experience races),