Review server upgrade and password provider pages

[sbesson]

This PR addresses two critical tickets for 5.0.0-beta2: https://trac.openmicroscopy.org.uk/ome/ticket/11787 and http://trac.openmicroscopy.org.uk/ome/ticket/11770

The server upgrade page on the sysadmin section should now:

• include a top-level warning about the new password provider with a link to the relevant configuration section
• show the exact DB upgrade commands when upgrading from either 5.0.0-beta1 or 4.4.9
• add a note about the need to reset the JVM memory settings after upgrade
  The 5.0.0-beta1 page about the no-upgrade from 4.4 is removed and the server upgrade page is added to the what's new page.

In addition to this documentation PR, a matrix job has been set up OMERO-upgrade-develop which tests most aspects of the upgrade as listed on the server upgrade page:

• fire up a previous server
• download the new binaries, update the DB
• perform the optimisation steps
• restarts the upgrade server with the upgrade server
• test the dump restore and restart the old server
  Some obvious next steps for this upgrade job are:
• fill the DB with some basic components (user, group, images, annotations…)
• test script upgrades

---

--rebased-to #994 (salting only)

[bpindelski]

The omero/developers/Server/PasswordProvider.txt:Things to keep in mind paragraph elements have either no dot or two dots at the end of the sentence.

[bpindelski]

omero/sysadmins/index.txt has OMERO.fs: file upload, Advanced configuration and LDAP authentication twice - once in Advanced topics and once in Advanced Server Installation.

[bpindelski]

Sentence could start with a capital letter?

[bpindelski]

Your OMERO configuration is stored using config.xml in the etc/grid `` - that's a nasty tick-ing around etc/grid in `sysadmins/server-upgrade.html`

[bpindelski]

Two spaces

[bpindelski]

Some comments left. OK to merge after they have been looked at. Thanks 👍

[hflynn]

Looks like this is good to merge now. @joshmoore are you happy this is clear? I'll merge this evening if no further comments.

[hflynn]

Actually, did you want to add the password thing to the whatsnew file too? It would make sense to have it on this PR. I'll leave off merging for tonight.

[hflynn]

Thanks. Merging now.