[MERGE] Extends the launchpad plugin's implementation of lp spec urls

[Tim Penhey]

Extends the launchpad plugin to handle lp urls of the form 
lp://staging/, lp://demo/, lp://dev/ to use the appropriate 
launchpad instance to do the resolution of the branch identities.

This is primarily of use to Launchpad developers, but can also
be used by other users who want to try out Launchpad as
a branch location without messing up their public Launchpad
account.  Branches that are pushed to the staging environment
have an expected lifetime of one day.

Tim
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