Fix 'on_*=rename-restart' domain configuration option.

Fix 'on_*=rename-restart' domain configuration option.

When setting e.g. 'on_crash=rename-restart' option in domain config
and crashing guest OS running in the domain, the new domain is
restarted with same name as renamed domain.

jfehlig4: # xm li
Name                                        ID   Mem VCPUs State Time(s)
Domain-0                                     0   1233   4  r----- 937.9
Domain-e64b12a0-0493-44d7-afde-55c776513426 21   384    1  ---c-  14.3
Domain-e64b12a0-0493-44d7-afde-55c776513426 22   384    1  r-----  7.3

This patch copies the domain info prior to setting new name and uuid
in the crashed domain info and uses the copied domain info to
construct the restarted domain.

Signed-off-by: Jim Fehlig <jfehlig@novell.com>