Test logging is already activated in test derived from
AbstractDaemonTest. Extract the code to activate the test logging in
new TestLoggingactivator class and also activate the log for tests
derived from GerritBaseTests class.
Also document in dev-bazel.txt how to increase log level for tests from
IDE and from Bazel.
Also remove some superfluous white spaces from dev-bazel.txt.
Change-Id: I7641bfcffa35e36c0330dc9244ceafd8366159ca
17ef12713b