When deploying the controller to a custom namespace, users have to
overwrite the namespace attribute as well as the hardcoded namespace
values in a number of args for the Deployment and the admission
controller Jobs.
Instead, this commit, uses the namespace name from the DownwardAPI,
and allows users to simply change the namespace attribute without
having to worry about the container args.
I would like to be able to support this construction in my DaemonSet, I have coontrol over the host and this is the easiest way yo bump the socket properties.
```yaml
securityContext:
sysctls:
- name: net.core.somaxconn
value: "8192"
```
The digest uniquely identifies a specific version of the image, so it is
never updated by Kubernetes unless you change the digest value. This is
desirable for security to gain confidence that no unvetted changes are
pulled to a deployment.
