[Merge] lp:~stgraber/upstart/upstart-fix-respawn into lp:upstart

[Steve Langasek]

Review: Needs Fixing

As discussed on IRC, this change should include an affirmative test case to ensure the correct values of ->script on respawn, to avoid this bug being reintroduced later.
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https://code.launchpad.net/~stgraber/upstart/upstart-fix-respawn/+merge/172420
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