Kubevirtci metal lb support

[davidvossel]

This PR adds two new commands

./kubevirtci install-metallb which installs and configures a metallb instance in the kubevirtci cluster
./kubevirtci curl-lb <lb name> <lb namespace> Which curls the load balancer services external ip and port then dumps the log output to stdout.
./kubevirtci install-capk which installs capk from the release manifests instead of source. This allows the kubevirtci script to be used outside of the capk source tree (like in cloud-provider-kubevirt or kubevirt csi)
./kubevirtci clean-cache which cleans the local clusterctl, virtctl, and tmp files used by kubevirtci

Example

Install metal lb

./kubevirtci install-metallb

Post these pods and LB service to the infra cluster

kind: Pod
apiVersion: v1
metadata:
  name: foo-app
  labels:
    app: http-echo
spec:
  containers:
  - name: foo-app
    image: hashicorp/http-echo:0.2.3
    args:
    - "-text=foo"
---
kind: Pod
apiVersion: v1
metadata:
  name: bar-app
  labels:
    app: http-echo
spec:
  containers:
  - name: bar-app
    image: hashicorp/http-echo:0.2.3
    args:
    - "-text=bar"
---
kind: Service
apiVersion: v1
metadata:
  name: foo-service
spec:
  type: LoadBalancer
  selector:
    app: http-echo
  ports:
  # Default port used by the image
  - port: 5678

Run kubevirtci curl-lb foo-service default and view the curl's output log

$ ./kubevirtci curl-lb foo-service default
HEAD is now at 8198e9c sync provider.sh between kind and kind-sriov (#587)
selecting docker as container runtime
selecting docker as container runtime
NAME          TYPE           CLUSTER-IP     EXTERNAL-IP      PORT(S)          AGE
foo-service   LoadBalancer   10.100.78.53   192.168.66.201   5678:30579/TCP   2m14s
selecting docker as container runtime
selecting docker as container runtime
selecting docker as container runtime
job.batch/curl-test-job created
-----------Waiting for curl job to complete
selecting docker as container runtime
job.batch/curl-test-job condition met
selecting docker as container runtime
-----------CURL LOG FOR POD curl-test-job-hb554
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100     4  100     4    0     0   2015      0 --:--:-- --:--:-- --:--:--  4000
foo

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidvossel

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[coveralls]

Pull Request Test Coverage Report for Build 2392981489

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 45.93%

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Totals
Change from base Build 2388980398:	0.0%
Covered Lines:	711
Relevant Lines:	1548

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💛 - Coveralls

[davidvossel]

/cc @nirarg
/ok-to-test

[nirarg]

/lgtm