change below file names for consistency

Xenserver625Resource.java  ->  XenServer625Resource.java
Xenserver625StorageProcessor.java  ->  XenServer625StorageProcessor.java
Revert "change below file names for consistency"

This reverts commit f8996fe837cd7906359652f327267fe6201d2407.
CLOUDSTACK-6170 (VMware root-disk support for managed storage)