[Bug 47029] Should always re-query xsane plugin at startup

[fubarbundy]

Public bug reported:

If xsane isn't re-queried, any USB changes (new devices, different
device addresses) are not picked up, and GIMP either doesn't show the
device in file/acquire/xsane or the device's menu entry results in an
error message because GIMP is trying to use the wrong/old device
address.

The current workaround is to delete ~/.gimp-2.2/pluginrc after every
device change.

** Affects: gimp (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

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Should always re-query xsane plugin at startup
https://launchpad.net/bugs/47029