iDempiere Monitor: Implement server and cache details for cluster node

Thanks @Heng Sin Low - it looks good

I added some more minor fixes here:

https://bitbucket.org/idempiere/idempiere/commits/ac7f5e8

@carlos, please review the new change set, thanks.

I’m conducting some tests to see why this is happening, it seems maybe a wrong management of the cache - monitoring the CCacheMgt.m_instances variable

Thanks @Heng Sin Low - nice addition.

The page for Cache Details doesn't look good after a few cache resets, it seems it keeps showing the cache line with zero size after refresh, and in some cases it looks duplicate:

https://bitbucket.org/idempiere/idempiere/commits/0040f48