tests: transparent hugepage relocated case add

Set khugepaged to a special set of configuration, monitor the memory
use status in host to see if it fit the behavior we expect.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
tests: Add thp memory stress test

Run stress in memory heavy configure in guest for transparent
hugepage memory stress testing.

Signed-off-by: Yiqiao Pu <ypu@redhat.com>
tests: Add a migration case for transparent hugepage

Signed-off-by: Yiqiao Pu <ypu@redhat.com>