Add in RSA key bit size specification to RSA generation gradle task.
Add in RSA key bit size specification to RSA generation gradle task.

phac-nml/irida,phac-nml/irida,phac-nml/irida,phac-nml/irida,phac-nml/irida,phac-nml/irida,phac-nml/irida,phac-nml/irida