ldapadmin - refactoring email related classes into the same package

There were 2 classes remaining in the old lib.mailservice package, so it
did not really make sense to keep them separated from the
ldapadmin.mailservice package.
ldapadmin - sourcing ldapadmin.properties files

This is to avoid the need of copy/replace the webmvc-config.xml file,
using the autogenerated WEB-INF/ldapadmin.properties instead.

this repairs runtime launch via jetty:run.
ldapadmin - begin runtime debug (jetty:run)