Due to changes in the structure of the production database, since
release 98 the value of analysis.logic_name corresponding to non-coding
RNA can be either 'ncrna' (which is what we used before) or
'ncrna_species_name'. Change the SQL query used to map RFAM IDs to
Ensembl stable IDs so that it can correctly handle species using the
latter syntax, i.e. human, mouse and zebrafish.

Issue: ENSINT-402