Various style fixes and cleanup #30

Job	Run time
build-test-matrix	3m 27s
check-commits-dispatcher	26s
build-pt	16m 34s
artifact-checks	20m 23s
hive-tests (config-hdp3)	3m 30s
error-prone-checks	5m 18s
test-jdbc-compatibility	4m 55s
maven-checks (17)	17m 32s
test-other-modules	9m 15s
web-ui-checks	41s
maven-checks (21)	16m 55s
check-commit	1s
test (plugin/trino-snowflake)	5m 32s
pt (default, suite-all-connectors-smoke, )	13m 40s
	1h 58m 9s

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