ISPN-2366 Rename state transfer config option 'waitForInitialStateTransf...

...erToComplete' to 'awaitInitialTransfer'

The previous name introduced in Beta6 was quite horrible, so let's fix this before the final release

Also revised javadoc and XSD documentation to higlight consequences of turning it off.

JIRA: https://issues.jboss.org/browse/ISPN-2366