Removed option to not use connection pooling - multiple server functionality will depend on pooling so we must always have it.
Removed option to not use connection pooling - multiple server functionality will depend on pooling so we must always have it.

Now uses generics. In preparation for change to use multiple servers.

thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck,thomasmaurel/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,Ensembl/ensj-healthcheck,thomasmaurel/ensj-healthcheck