Use cluster-admin ClusterRoleBinding

[rsevilla87]

Signed-off-by: Raul Sevilla rsevilla@redhat.com

Description

I think it's better to use a cluster-admin ClusterRole. At the moment it's difficult to manage the permissions required by most of benchmarks.
Some of them already have privileged permissions, their own Roles/Bindings files, etc. We should reduce the amount of things we manage.

I know this is not a security-friendly practice, but running performance benchmarks in a cluster is 99% of cases executed by a cluster's administrator

This should simplify the things a little bit.

[dry923]

LGTM minus the slew of failed tests. Not sure those are actually related to this change :-/

[codecov-commenter]

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