Add -m flag to gsutil mv step

[mmorgantaylor]

I added -m to gsutil cp in a previous PR but missed the gsutil mv step post-bq load - so here that is. tested it from the command line, works well. also confirmed that it will throw an error if one (or more) files has an error:

$ cat test_files_bucket.txt | gsutil -m mv -I gs://dsp-fieldeng-dev/test_mv/

If you experience problems with multiprocessing on MacOS, they might be related to https://bugs.python.org/issue33725. You can disable multiprocessing by editing your .boto config or by adding the following flag to your command: `-o "GSUtil:parallel_process_count=1"`. Note that multithreading is still available even if you disable multiprocessing.

Copying gs://dsp-fieldeng-dev/test_cp/test1.txt [Content-Type=text/plain]...
Copying gs://dsp-fieldeng-dev/test_cp/test2.txt [Content-Type=text/plain]...
CommandException: No URLs matched: gs://dsp-fieldeng-dev/test_cp/test4.txt
Copying gs://dsp-fieldeng-dev/test_cp/test3.txt [Content-Type=text/plain]...
Copying gs://dsp-fieldeng-dev/test_cp/test5.txt [Content-Type=text/plain]...
Copying gs://dsp-fieldeng-dev/test_cp/test6.txt [Content-Type=text/plain]...
Removing gs://dsp-fieldeng-dev/test_cp/test1.txt...
Removing gs://dsp-fieldeng-dev/test_cp/test2.txt...
Removing gs://dsp-fieldeng-dev/test_cp/test3.txt...
Removing gs://dsp-fieldeng-dev/test_cp/test5.txt...
Removing gs://dsp-fieldeng-dev/test_cp/test6.txt...
- [5/5 files][   37.0 B/   37.0 B] 100% Done
Operation completed over 5 objects/37.0 B.
CommandException: 1 file/object could not be transferred.

[ahaessly]

👍