featuretests: failure on windows due to ill informed symlink

[Dave Cheney]

upgrade_test.go:109:
    go func() { c.Check(a.Run(nil), jc.ErrorIsNil) }()
... value *errors.Err = &errors.Err{message:"failed to create C:/Juju/bin/juju-run.exe symlink", cause:(*os.LinkError)(0xc084427f00), previous:(*os.LinkError)(0xc084427f00), file:"github.com/juju/juju/cmd/jujud/agent/machine.go", line:1775} ("failed to create C:/Juju/bin/juju-run.exe symlink: symlink c:\\users\\admini~1\\appdata\\local\\temp\\tmpivnvca\\gogo\\tmp-juju-testtxo382\\check-5796262061010820532\\7\\var\\lib\\juju\\tools\\machine-0\\jujud.exe c:\\users\\admini~1\\appdata\\local\\temp\\tmpivnvca\\gogo\\tmp-juju-testtxo382\\check-5796262061010820532\\13\\Juju\\bin\\juju-run.exe: GetFileAttributesEx c:\\users\\admini~1\\appdata\\local\\temp\\tmpivnvca\\gogo\\tmp-juju-testtxo382\\check-5796262061010820532\\7\\var\\lib\\juju\\tools\\machine-0\\jujud.exe: The system cannot find the path specified.")
... error stack:
 symlink c:\users\admini~1\appdata\local\temp\tmpivnvca\gogo\tmp-juju-testtxo382\check-5796262061010820532\7\var\lib\juju\tools\machine-0\jujud.exe c:\users\admini~1\appdata\local\temp\tmpivnvca\gogo\tmp-juju-testtxo382\check-5796262061010820532\13\Juju\bin\juju-run.exe: GetFileAttributesEx c:\users\admini~1\appdata\local\temp\tmpivnvca\gogo\tmp-juju-testtxo382\check-5796262061010820532\7\var\lib\juju\tools\machine-0\jujud.exe: The system cannot find the path specified.
 github.com/juju/juju/cmd/jujud/agent/machine.go:1775: failed to create C:/Juju/bin/juju-run.exe symlink

upgrade_test.go:112:
    c.Assert(waitForUpgradeToStart(upgradeCh), jc.IsTrue)
... obtained bool = false

[LOG] 0:10.663 DEBUG juju.worker killing runner 0xc084e90d80
[LOG] 0:10.663 INFO juju.worker runner is dying
[LOG] 0:10.664 INFO juju.apiserver [CD] user-dummy-admin@local API connection terminated after 10.2040066s
[LOG] 0:10.664 DEBUG juju.state closed state without error
[LOG] 0:10.664 INFO juju.provider.dummy reset environment
[LOG] 0:10.664 DEBUG juju.state closed state without error
[LOG] 0:10.670 INFO juju.testing reset successfully reset admin password
[LOG] 0:10.682 INFO juju.testing reset successfully reset admin password
[LOG] 0:10.685 INFO juju.testing reset successfully reset admin password
OOPS: 106 passed, 1 skipped, 1 FAILED
--- FAIL: TestPackage (127.83 seconds)
FAIL
FAIL github.com/juju/juju/featuretests 128.625s

http://juju-ci.vapour.ws:8080/job/run-unit-tests-win2012-amd64/1659/console

[Menno Finlay-Smits (menno.smits)]

https://github.com/juju/juju/pull/3863