Only actually use tqdm in verbose mode

Duncan Macleodrequested to merge
github/fork/duncanmmacleod/no-progress-bar into develop

This PR works around an apparent bug in (old versions of) tqdm that would cause errors like the following when querying for segments:

Traceback (most recent call last):
  File "/home/duncan.macleod/opt/gwpysoft-2.7/lib/python2.7/site-packages/gwpy/segments/flag.py", line 1601, in populate
    on_error=on_error, **kwargs)
  File "/home/duncan.macleod/opt/gwpysoft-2.7/lib/python2.7/site-packages/gwpy/segments/flag.py", line 1087, in query
    return query_(flags, *args, **kwargs)
  File "/home/duncan.macleod/opt/gwpysoft-2.7/lib/python2.7/site-packages/gwpy/segments/flag.py", line 1241, in query_dqsegdb
    raise result
AttributeError: 'tqdm' object has no attribute 'pos' [H1:DCH-PSL_ISS_OMICRON_SNR_GT_45:1]

I think this has something to do with the fact that both gwpy and tqdm are threading at the same time. This patch modifies gwpy.utils.mp to only create a tqdm progress bar when verbose=True is specified, making it much less likely that this error will occur. This makes the relevant function a little more complex, but much more stable on LDAS.

cc @kentblackburn

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