[MERGE][bug 334028] Mention --force when bzr switch fails to open the current master branch.

[Jelmer Vernooij]

This trivial patch makes ``bzr switch`` mention --force when it fails
to open the current master branch, as user may want to use it if the
original master branch has moved.

See bug https://bugs.edge.launchpad.net/bzr/+bug/334028 for a
background.

Cheers,

Jelmer
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