Audit hooks on JSON/RPC and SSH commands using Gerrit plugins.

New @Audit annotation to enable invocation of
AuditService injected on GerritGlobalModule.

Annotation applies to JSON/RPC interfaces whilst
on the SSH side audit is "hooked" directly into
SshLog class.

Enables the integration of Audit plugins through
the implementation of audit-listeners.
Dynamic loading and unloading of audit plugins is supported
through the @Extension/@Listener association and
automatically loaded and unloaded using Plugin
module self-registration.

In order to implement a new AuditListener implementation
you only to:

1) Define an implementation of AuditListener and annotate
as:

@Listener
public class MyAuditTrail extends AuditListener

2) Define a Plugin Module to bind your Audit implementation
in the configure() method as:

DynamicSet.bind(binder(), AuditListener.class)
  .to(MyAuditTrail.class);

Change-Id: Iaa26c4687a4ef4cbe27fe8396a5e0b8f6627536f
Signed-off-by: Luca Milanesio <luca.milanesio@gmail.com>

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

@@ -228,7 +228,7 @@ class CommandFactoryProvider implements Provider<CommandFactory> {
   }
 
   /** Split a command line into a string array. */
-  static String[] split(String commandLine) {
+  static public String[] split(String commandLine) {
     final List<String> list = new ArrayList<String>();
     boolean inquote = false;
     boolean inDblQuote = false;