Checkstyle 8.1 (#584)

Added a few checks too:
- SimplifyBooleanExpression
- SimplifyBooleanReturn
- StringLiteralEquality
- UnnecessaryParentheses

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/test/AntJunitLanucher.java

@@ -23,7 +23,7 @@ import java.io.File;
 public class AntJunitLanucher {
 
   /**
-   * Main entry point for jenkins
+   * Main entry point for jenkins.
    *
    * @param args Arguments passed to java.
    */

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/test/TestBench.java

@@ -343,7 +343,7 @@ public final class TestBench {
         false));
     encoderPortPairs.addAll(getPairArray(getDIOCrossConnect().get(1), getDIOCrossConnect().get(0),
         false));
-    assert (encoderPortPairs.size() == 8);
+    assert encoderPortPairs.size() == 8;
     return encoderPortPairs;
   }
 

wpilibjIntegrationTests/src/main/java/edu/wpi/first/wpilibj/test/TestSuite.java

@@ -153,7 +153,7 @@ public class TestSuite extends AbstractTestSuite {
 
   /**
    * Parses the arguments passed at runtime and runs the appropriate tests based upon these
-   * arguments
+   * arguments.
    *
    * @param args the args passed into the program at runtime
    * @return the restults of the tests that have run. If no tests were run then null is returned.