Revert "Additional log on plug-in self-registration and failures."

This reverts commit c0732b1301


The commit broke server startup with:

java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
        at com.google.gerrit.extensions.registration.DynamicSet.<clinit>(DynamicSet.java:45)
        at com.google.gerrit.server.config.GerritGlobalModule.configure(GerritGlobalModule.java:146

gerrit-extension-api/pom.xml

@@ -47,11 +47,6 @@ limitations under the License.
       <groupId>org.apache.tomcat</groupId>
       <artifactId>servlet-api</artifactId>
     </dependency>
-
-    <dependency>
-      <groupId>org.slf4j</groupId>
-      <artifactId>slf4j-api</artifactId>
-    </dependency>
   </dependencies>
 
   <build>

gerrit-extension-api/src/main/java/com/google/gerrit/extensions/registration/DynamicSet.java

@@ -25,9 +25,6 @@ import com.google.inject.name.Named;
 import com.google.inject.util.Providers;
 import com.google.inject.util.Types;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
@@ -42,7 +39,6 @@ import java.util.concurrent.atomic.AtomicReference;
  * registrations to decide between singleton and non-singleton members.
  */
 public class DynamicSet<T> implements Iterable<T> {
-  private static final Logger log = LoggerFactory.getLogger(DynamicSet.class);
   /**
    * Declare a singleton {@code DynamicSet<T>} with a binder.
    * <p>
@@ -151,8 +147,7 @@ public class DynamicSet<T> implements Iterable<T> {
             try {
               next = p.get();
             } catch (RuntimeException e) {
-              log.error("Cannot get iterated object from provider " + p
-                  + ": object discared", e);
+              // TODO Log failed member of DynamicSet.
             }
           }
         }

gerrit-server/src/main/java/com/google/gerrit/server/plugins/AutoRegisterModules.java

@@ -192,12 +192,10 @@ class AutoRegisterModules {
 
     if (is("org.apache.sshd.server.Command", clazz)) {
       if (sshGen != null) {
-        PluginLoader.log.info("Exporting " + clazz + " as SSH Command");
         sshGen.export(export, clazz);
       }
     } else if (is("javax.servlet.http.HttpServlet", clazz)) {
       if (httpGen != null) {
-        PluginLoader.log.info("Exporting " + clazz + " as HTTP Servlet");
         httpGen.export(export, clazz);
         listen(clazz, clazz);
       }
@@ -249,7 +247,6 @@ class AutoRegisterModules {
         TypeLiteral<?> tl = TypeLiteral.get(type);
         if (env.hasDynamicSet(tl)) {
           sysSingletons.add(clazz);
-          PluginLoader.log.info("Registering " + clazz + " to listener " + tl);
           sysListen.put(tl, clazz);
         } else if (env.hasDynamicMap(tl)) {
           if (clazz.getAnnotation(Export.class) == null) {
@@ -258,7 +255,6 @@ class AutoRegisterModules {
                 clazz.getName(), rawType.getName()));
           }
           sysSingletons.add(clazz);
-          PluginLoader.log.info("Registering " + clazz + " to listener " + tl);
           sysListen.put(tl, clazz);
         } else {
           throw new InvalidPluginException(String.format(