Clean up Java warning suppressions (#4433)

Checkstyle naming conventions were changed to allow most of what's in
wpimath. Naming rules were disabled completely in wpimath since almost
all suppressions are for math notation.

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/fixtures/MotorEncoderFixture.java

@@ -152,7 +152,6 @@ public abstract class MotorEncoderFixture<T extends MotorController> implements
    * deallocated.
    */
   @Override
-  @SuppressWarnings("Regexp")
   public void teardown() {
     if (!m_tornDown) {
       if (m_motor != null) {