Missing f.close() for the coinc.xml file in serialize.py

The changes between v2.7.1 and v2.8.0 introduced this bug (if I am understanding things correctly). The code in gracedb/events/serialize.py,

    file_path = os.path.join(root_dir, xml_fname)
    f = VersionedFile(file_path, 'w')
    xmldoc.write(f.file)

is not followed by an f.close() line.

(I tracked this down after Leo noticed that the symlink was not created for the coinc.xml file, and the close method for a VersionedFile object is what creates/updates the symlink.)

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