Update configuration.md

Using FQDN in the "Two connections" example, to make it clear.
cs-fix
Merge pull request #286 from UFOMelkor/cs-fixes

cs-fix
Merge pull request #284 from liorch88/patch-1

Update configuration.md to use FQDN for classes
Add hydration cache configuration setting
Merge pull request #288 from glen-84/master

Add hydration cache configuration setting