[users at bb.net] Force button disappears when I change the buildername

[Ed Singleton]

Using buildbot==0.9.0b7 when I create a sample config using `buildbot
create-master master` and then start the server, there is a "Force" button
in the web interface for that builder (http://localhost:8020/#/builders/1).

If in master.cfg I rename that builder from 'runtests' to 'mybuild'
everywhere in the whole file, and then run `buildbot reconfig master`, the
force button disappears.  I can see from the log that it removed and added
1 changesource, and removed and added 1 builder (but not a scheduler, even
though I did change the scheduler).

If I rename the scheduler and run `buildbot reconfig master`, then it
updates correctly, and the Force button reappears, with whatever new name I
gave it.

I found this to be very surprising behaviour, although I do now know how to
get around it.

Ed
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