Juju says windows mongo: invalid version

[Curtis Hovey]

As seen in
    http://reports.vapour.ws/releases/issue/576d7159749a562fd687e505

Most of the unit test will not run on windows because mgo.go it does not like the version
    failed to start mongo: invalid version "2.4.11-pre\r"
or
    failed to start mongo: invalid version "2.6.3\r"

Maybe the trailing \r is not handled properly by mgo.go

[Curtis Hovey (sinzui)]

This failure was first seen in commit 61e062c. Not seen in 90b234d. the suspect commit is
    https://github.com/juju/juju/commit/886a23e950b350e51bed0c5eb00e1a8e212c0f84

The likely cause is detectMongoVersion() which splits on "\n"
    parts := strings.SplitN(string(output), "\n", 2)

[Christian Muirhead (2-xtian)]

Sorry, I'll fix that right away!

[Christian Muirhead (2-xtian)]

juju/testing PR https://github.com/juju/testing/pull/105
juju/juju PR https://github.com/juju/juju/pull/5717