Upgrade to Spring Data Lovelace RC2

[mp911de]

Review of Spring Boot dependencies with a relation to Spring Data (Lovelace):

• ✅ JPA: Spring Data builds against Hibernate 5.2.17, Boot uses Hibernate 5.3.5, versions are compatible, no change required
• ✅ LDAP: Spring LDAP 2.3.2, no change required
• ✅ MongoDB: Sync driver 3.8.0, Reactive Streams driver 1.9.0, no change required
• ✅ Redis: Jedis 2.9.0, Lettuce 5.1.0M1, no change required
• ✅ Cassandra: Driver 3.5.1, no change required
• ✅ Solr: Spring Data builds against Solrj 5.2.17, Boot uses Solrj 7.4.0, versions are compatible, no change required
• ✅ Couchbase: Driver 2.6.1, no change required
• ⚠️ Neo4j: Spring Data builds against OGM 3.1.1-RC2, Boot uses 3.1.0. OGM 3.1.1 (Final) will be released soon and Data and Boot should upgrade to 3.1.1, see #13999
• ✅ ElasticSearch: Spring Data builds against ES 6.2.2, Boot uses 6.3.2, versions are compatible, no change required

[meistermeier]

Suggesting a green check mark for Neo4j(-OGM) because 3.1.1 is now released and upgraded in Spring Data Neo4j Lovelace RC2/5.1.