Update dependencies and submodules

[yvanzo]

Update:

• Apache Solr to (latest 7.x version) 7.7.2 (checked upgrade notes to 7.6.0, 7.7.0, 7.7.1, and 7.7.2);
• EclipseLink to 2.7.4;
• mbsssss to latest tag v-2019-06-17;
• mmd-schema to latest tag v-2019-01-07.

Actions to be taken after merge:

• Releasing a new version of mb-solr;
• Updating musicbrainz-docker (and musicbrainz-vm later on);
• Updating mb-solr-cloud;
• Deploying sir and mb-solr-cloud;
• Reindexing.

[mineo]

I think this might not be safe to merge because

• metabrainz/mmd-schema@0d71e48
• metabrainz/mmd-schema@fe6ed6e
• metabrainz/mmd-schema@8600db4

change and/or add new non-optional attributes. Since sir pre-generates the XML documents that conform to the MB schema and the QueryWriter classes in this repository de-serialize, annotate and re-serialize those, merging this means that sir would write documents into Solr that can't be de-serialized by the JAXB bindings (I think, or maybe it just ignores missing values). In order to get a version of sir that writes values that the newer JAXB binding can read, https://github.com/metabrainz/mb-rngpy also needs to be updated, as well as the code in https://github.com/metabrainz/sir/blob/master/sir/wscompat/convert.py that touches the affected XML elements, at least the following:

• https://github.com/metabrainz/sir/blob/3a5098ff6873945d4ceaa3e4512b9c24d26cd08f/sir/wscompat/convert.py#L1047
• https://github.com/metabrainz/sir/blob/3a5098ff6873945d4ceaa3e4512b9c24d26cd08f/sir/wscompat/convert.py#L85-L97

and rebuild all indexes that include the affected elements :-(

9231758 looks fine.

[sambhav]

The other dependencies(apart from the lucene/solr on es) that you updated - how did come to those versions?. If they don't match the ones use in docker solr, it will fail with a bunch of errors due to multiple conflicting packages.

Edit - Ah I see you used mvn versions plugin - that won't work. I can explain this better on irc later if you want.

[yvanzo]

Yes, I used Versions Plugin with maven.

[yvanzo]

Updates:

• Java dependencies have been updated without using Versions Plugin or Maven;
• mb-rngpy has been updated to bind the latest mmd-schema 2.0 v-2019-01-07 in PR Update to MMD schema 2.0 v-2019-01-07  mb-rngpy#3 and released as version 2.20190107.0 on both GitHub and PyPI;
• SIR has been updated to use that version of mb-rngpy in Update SIR to MMD schema 2.0 v-2019-01-07 sir#103,
  it has been updated to use more recent PySolr bindings and the latest mbdata 25.0.0 bindings too.
  (Note: database schema change 25 did not impact mmd-schema for now.)

Still missing:

• PR Update luceneMatchVersion to 7.7.1 mbsssss#52 should be reviewed and merged,
  then a new version of mbsssss should be released,
  finally this PR should be updated to depend on that version.

[mineo]

The changes and the steps you'll take after merging look good to me!