Various minor changes

- AsynchronousLogin: call common permission methods through CommonService instead of PermissionsManager
- CommandManager: remove superfluous replacement of %p (handled by lazy tag replacer)
- Remove unused method in CommonService
- Create DebugSectionConsistencyTest
- SendMailSSL: Enable debug output if AuthMe log level is set to debug
- Add Utils#logAndSendMessage and replace existing, separate implementations

src/test/java/fr/xephi/authme/command/executable/authme/debug/DebugSectionConsistencyTest.java

@@ -0,0 +1,51 @@
+package fr.xephi.authme.command.executable.authme.debug;
+
+import fr.xephi.authme.ClassCollector;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.lang.reflect.Modifier;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.fail;
+
+/**
+ * Consistency tests for {@link DebugSection} implementors.
+ */
+public class DebugSectionConsistencyTest {
+
+    private static List<Class<?>> debugClasses;
+
+    @BeforeClass
+    public static void collectClasses() {
+        debugClasses = new ClassCollector("src/main/java", "fr/xephi/authme/command/executable/authme/debug")
+            .collectClasses();
+    }
+
+    @Test
+    public void shouldAllBePackagePrivate() {
+        for (Class<?> clazz : debugClasses) {
+            if (clazz != DebugCommand.class) {
+                assertThat(clazz + " should be package-private",
+                    Modifier.isPublic(clazz.getModifiers()), equalTo(false));
+            }
+        }
+    }
+
+    @Test
+    public void shouldHaveDifferentSubcommandName() throws IllegalAccessException, InstantiationException {
+        Set<String> names = new HashSet<>();
+        for (Class<?> clazz : debugClasses) {
+            if (DebugSection.class.isAssignableFrom(clazz) && !clazz.isInterface()) {
+                DebugSection debugSection = (DebugSection) clazz.newInstance();
+                if (!names.add(debugSection.getName())) {
+                    fail("Encountered name '" + debugSection.getName() + "' a second time in " + clazz);
+                }
+            }
+        }
+    }
+}