Swap order of real and mock in multiplexer

This ensures we return the mock evaluations instead of the real
evaluations in specs.

Change-Id: Ief51d6fbafd73dc065924af311b39a8330c2213c
Reviewed-on: http://gerrit.causes.com/39131
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>
Tested-by: Shane da Silva <shane.dasilva@brigade.com>
Update changelog with #multi block fix

Change-Id: Ib1eab68c77d02402786b7f9252bacb6a2195ed2c
Reviewed-on: http://gerrit.causes.com/39132
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>
Tested-by: Shane da Silva <shane.dasilva@brigade.com>