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The discovering property in bluez is often delayed in updating.  This
has caused issues in the past. This change ensures that that property is
only used in testing so that it will no longer cause any bugs.

Bug: 1013678
Change-Id: I8afbdef6385189d62b1d47ceee16474da06d2caa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003355
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737061}