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Add a dbus client method for the DestroyDiskImage Concierge service. Add a method to CorstiniManager to check the input. This is not used yet. Will be used in my next CL which adds a button in the Settings page to delete Crostini VMs.

Bug: 833125

Change-Id: I6dd817a23764b484f4ac507adb0566ccbfeac5df
Reviewed-on: https://chromium-review.googlesource.com/1013657Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Commit-Queue: Renée Wright <rjwright@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551244}