add gotestsum, a tool for prettier log output
add gotestsum, a tool for prettier log output

can also do junit xml output if we care about that

Signed-off-by: Ashley Davis <2a98ad09b55d7402451cbad533f334a828c02124@jetstack.io>

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