Expose metrics server on non-leader instances
Expose metrics server on non-leader instances

This makes sure all cert-manager instances have a metrics endpoint.

Fixes #1352.

Signed-off-by: Louis Taylor <d82ece8d514aca7e24d3fc11fbb8dada57f2966c@kragniz.eu>

jetstack/cert-manager,jetstack-experimental/cert-manager,cert-manager/cert-manager,jetstack-experimental/cert-manager,cert-manager/cert-manager,cert-manager/cert-manager,jetstack/cert-manager,jetstack-experimental/cert-manager,jetstack/cert-manager