Portal Cache Gogo Command

This module adds some Gogo commands to interact with Liferay cache just like the Control Panel section.
All the commands are within the "cache" scope as follows:

• cache:clearDb, clears the database cache
• cache:clearSingle, clears content cached by this VM
• cache:clearMulti, clears content cached across the cluster
• cache:clearServlet, clears the direct servlet cache
• cache:clearAll, invokes all of the commands above