[telemetry] Minor Cloud Storage script fixes.
[telemetry] Minor Cloud Storage script fixes.

- Fix error where you couldn't list buckets if you didn't have access to all of them.
- Fix bug where listing with shell completion (page_sets/*) would only give the first file.
- Skip moving files if the destination bucket is the same as the source bucket.
- Remove checks that all files exist. If you use shell completion, you will include files that don't have hash files, just ignore them.


BUG=None.
TEST=None.

Review URL: https://codereview.chromium.org/215423004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@260435 0039d316-1c4b-4281-b951-d872f2087c98

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