Replace hitting servers with query to Production DB

[leannehaggerty]

ensembl-genes-metadata/src/python/ensembl/genes/metadata/sync_meta_database_production_db.py

Line 229 in 51b3039

for row in rapid_dbs:

Currently the code hits the staging-5 servers (RRHOST1/2) to get a list of databases that need to be updated in the genebuild metadata database. This information would be better sourced from the Production metadata database.

Leanne: add db server details + command advice