[NGRINDER-525] Fix checkstyle issues.
[NGRINDER-528] Make agent monitor data saved in db
[NGRINDER-525] Fix typo
[NGRINDER-529] 
Add the IAgentManagerService as interface for dependency injection on
plugin.
Add the method in SingleConsole to extact the currently attaching
agents.
Move AgentInfo class to core.
[NGRINDER-530] Make the network detection as plugin