Bug 1871145

Document URL:
https://docs.openshift.com/container-platform/4.4/networking/multiple_networks/configuring-bridge.html#nw-multus-create-network_configuring-bridge

Section Number and Name: 
Procedure, step 2

Describe the issue: 
In a customer case, he creates the exact configuration as described in the doc's example:
~~~
  additionalNetworks:
  - name: test-network-1
    namespace: default
    rawCNIConfig: '{ "cniVersion": "0.3.1", "name": "test-network-1", "type": "bridge",
      "ipam": { "type": "static", "addresses": [ { "address": "191.168.1.7" } ] }
      }'
    type: Raw
~~~

but it fails with error:
~~~
  message: 'Failed to create pod sandbox: rpc error: code = Unknown desc = failed
    to create pod network sandbox k8s_bridge-pod-1_default_f7912f37-249e-4cae-865e-5c3e4f29b322_0(f579e0734e405142e1d3c28e190ef36794dc03bf713e1fe6fe8ac1497e80e5b4):
    Multus: [default/bridge-pod-1]: error adding container to network "test-network-1":
    delegateAdd: error invoking DelegateAdd - "bridge": error in getting result from
    AddNetwork: invalid CIDR 191.168.1.7: invalid CIDR address: 191.168.1.7'
~~~

witch makes sense as "191.168.1.7" lacks netmask prefix and doesn't qualify as a CIDR.


Suggestions for improvement: 
- Correct this error by adding the CIDR
- Not sure if this applies to openshift but in upstream multus it looks like there are more options and parameters (like ranges) that can be defined and that are not present in openshift documentation:
  https://github.com/intel/multus-cni/blob/master/doc/configuration.md
  e.g.:
  config: '{
      "cniVersion": "0.3.0",
      "type": "macvlan",
      "master": "eth0",
      "mode": "bridge",
      "ipam": {
        "type": "host-local",
        "subnet": "192.168.1.0/24",
        "rangeStart": "192.168.1.200",
        "rangeEnd": "192.168.1.216",
        "routes": [
          { "dst": "0.0.0.0/0" }
        ],
        "gateway": "192.168.1.1"
      }
    }'


Additional information: