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This CL adds a quick change to boot_data.py that makes the output
directory path absolute before provisioning SSH files, to work around
ZX-2397

Bug: https://fuchsia.atlassian.net/browse/ZX-2397
Change-Id: Iae0c2f8bd992e14bc3d7bcce88c82e65407b829b
Reviewed-on: https://chromium-review.googlesource.com/1147247
Commit-Queue: Stephan Stross <stephanstross@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577317}