Bug 1115146 - Purge (delete) data using smaller batches

1. full scan (only once) the table or index, and put the keys of the rows to delete in a temporary file
2. delete the rows by primary key in batches
[BZ 1069547] Support shutdown of domain controller in ServerControl

This fixes the patching domain controllers which failed if restart
was demanded during the deployment.

Also optimized the reading of host.xml (to find the host of the domain
controller in the domain) to use SAX parser instead of DOM. This is
much lighter on resources and should also be much quicker because we
only need to read first couple of lines of the file.
[1001383] getResourceConfiguration does not return the current resource configuration
Improve some ConfigurationManagerRemote javadoc, making it more clear that
getLatestResourceConfigurationUpdate() satisifies the API request in the BZ (I think).
BZ 1124619 - provide more responsiveness when you want to ask an agent to update itself from the GUI. There is now a "update agent" operation, rather than requiring the user to use "update --update".