Bug 974082: Bustage fix to use mock target from config if it's not explicitly set. r=bhearsum
merged from default

changeset:   2449:eccc8fbf5f95
tag:         tip
parent:      2447:1d76e49c960c
user:        Chris AtLee <catlee@mozilla.com>
date:        Fri Feb 21 10:44:51 2014 -0500
summary:     Bug 974082: Bustage fix to use mock target from config if it's not explicitly set. r=bhearsum

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branch : production