Revert "SSHD: Prevent double authentication for the same public key"

This reverts commit a5959d2216.

This revert is necessary because of downgrade to the SSHD 0.9.0.

Change-Id: Ia41ad2d9a713ddd515bc383923844227b676070f

gerrit-sshd/src/main/java/com/google/gerrit/sshd/SshModule.java

@@ -81,7 +81,7 @@ public class SshModule extends LifecycleModule {
     bind(QueueProvider.class).to(CommandExecutorQueueProvider.class).in(SINGLETON);
 
     bind(GSSAuthenticator.class).to(GerritGSSAuthenticator.class);
-    bind(PublickeyAuthenticator.class).to(CachingPublicKeyAuthenticator.class);
+    bind(PublickeyAuthenticator.class).to(DatabasePubKeyAuth.class);
 
     bind(ModuleGenerator.class).to(SshAutoRegisterModuleGenerator.class);
     bind(SshPluginStarterCallback.class);