Reduce the number of cells in Ireland
Reduce the number of cells in Ireland

As more tenants have migrated over to London we have a surplus of cells in
Ireland, this commit removes another 3. Further reductions will take place over
successive PRs.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf