fix flaky test in SentinelConfigTest #1884
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Fixed flaky test testDefaultConfig that caused by testColdFactoryLargerThanOne in SentinelConfigTest
If we run testColdFactoryLargerThanOne first, it will modify SentinelConfig.COLD_FACTOR.
Then when we run testDefaultConfig, the code assertEquals(SentinelConfig.DEFAULT_CHARSET, SentinelConfig.charset()) will have issue.
The flaky tests are found by running https://github.com/idflakies/iDFlakies
Describe how you did it:
Set a before and after method to set the variables to the default value.