change host and rtexe

Change-Id: I3e4006c9688ac9d0c8f970ba4bc4f924ac591e91
change host

Change-Id: I353d09a14a54a141c7cb702ba7233022f500784e
add back_hosts

Change-Id: Ib770c9c955de4a659500055edd54c72cd8bec8d2