Reset log levels reliably.

src/test/java/com/zaxxer/hikari/pool/MiscTest.java

@@ -128,6 +128,7 @@ public class MiscTest
          finally
          {
             setConfigUnitTest(false);
+            setSlf4jLogLevel(HikariPool.class, Level.INFO);
          }
       }
    }

src/test/java/com/zaxxer/hikari/pool/TestConnectionTimeoutRetry.java

@@ -273,5 +273,6 @@ public class TestConnectionTimeoutRetry
    public void after()
    {
       System.getProperties().remove("com.zaxxer.hikari.housekeeping.periodMs");
+      setSlf4jLogLevel(HikariPool.class, Level.INFO);
    }
 }