omero.tables.HdfList:
Since two calls to tables.openFile() return non-equal files with
equal fileno's, portalocker cannot be used to prevent the creation
of two HdfStorage instances from the same Python process.
omero.util.StreamRedirect:
Since all server components should exclusively using the logging
module any output to stdout or stderr is caught and logged at
"WARN".
omero.util.upgrade_check.UpgradeCheck:
Port of Java UpgradeCheck:
https://trac.openmicroscopy.org.uk/omero/browser/trunk/components/common/src/ome/system/UpgradeCheck.java