Warn if omero.db.poolsize is not set.

[mtbc]

Fixes ome/omero-server#84 by printing the suggested message during omero admin start if omero.db.poolsize has not been configured.

[joshmoore]

In general, 💯

However, for me this prints out as:

(omero) /opt/omero-py $omero admin start
WARNING: Your server has not been configured for production use. See https://docs.openmicroscopy.org/omero/latest/sysadmins/server-performance.html?highlight=poolsize for more information.
No descriptor given. Using etc/grid/default.xml
Waiting on startup. Use CTRL-C to exit

I wonder if there won't be other similar items to check for (certificates?) in which case we might not want an entire block printed at the top.

[joshmoore]

NB: I could see getting a quick release with this included.

[mtbc]

Would it be better differently formatted, or maybe printed later?

[joshmoore]

For the moment, I think having at the top is fine. I'd just make it blockier.

[mtbc]

Now updated to:

WARNING: Your server has not been configured for production use.
See https://docs.openmicroscopy.org/omero/latest/sysadmins/server-performance.html?highlight=poolsize
for more information.

[sbesson]

(venv) sbesson@ls30630:OMERO.server-5.6.0-191-6fd2072-ice36-b466 $ omero admin start
WARNING: Your server has not been configured for production use.
See https://docs.openmicroscopy.org/omero/latest/sysadmins/server-performance.html?highlight=poolsize
for more information.
No descriptor given. Using etc/grid/default.xml
Waiting on startup. Use CTRL-C to exit

Overall, this feels like our best strategy for displaying useful hardening warnings at the level of the admin start command. I will look into releasing a patch release of omero-py.