ISPN-2475 When L1.onRehash is enabled, L1 invalidations should be sent

to the previous owners

* Changed L1 on rehash to properly add requestors for previous owners
* Reenabled tests for L1 on rehash to confirm working
* Removed unneeded looping in InvalidateL1Command as track modified keys

https://issues.jboss.org/browse/ISPN-2475