CBQE-0: more logs if init RemoteMachineShellConnection failed

Change-Id: Ifb3efdf9ea6f3362b060ffdb58a14acee28eeca9
Reviewed-on: http://review.couchbase.org/27226
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>
CBQE-0: minor changes in py-newrebalance.conf

Change-Id: I2b983f7999c928563336f4de2b3b7bb809ff8c7d
Reviewed-on: http://review.couchbase.org/27243
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>