Add host platform to ByoHost CR info on registration

[shubham14bajpai]

Signed-off-by: Shubham Bajpai [email protected]

What this PR does / why we need it:

This PR adds the host platform information (arch/os/distribution) to the ByoHost CR when the agent registers the host. Tested the same locally and this is what the CR would look like.

$ kubectl get byohosts host1 -oyaml
apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
kind: ByoHost
metadata:
  creationTimestamp: "2022-04-25T05:52:54Z"
  generation: 1
  name: host1
  namespace: default
  resourceVersion: "169327"
  uid: 572acde9-2d80-446c-ab7a-260f71e8e8f4
spec: {}
status:
  conditions:
  - lastTransitionTime: "2022-04-25T05:52:55Z"
    reason: WaitingForMachineRefToBeAssigned
    severity: Info
    status: "False"
    type: K8sNodeBootstrapSucceeded
  hostinfo:
    architecture: arm64
    osimage: Ubuntu 20.04.4 LTS
    osname: linux
  network:
  ...

This PR also adds additional printers for the Byohost CRD and with those the output would look like this:

$ kubectl get byohost                                                  
NAME    OSNAME   OSIMAGE              ARCH
host1   linux    Ubuntu 20.04.4 LTS   amd64
host2   linux    Ubuntu 20.04.4 LTS   amd64

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #470

Additional information
The function added in this PR fetches information directly from files from the underneath operating system. Hence not sure how to add a test for the same.

Special notes for your reviewer

[codecov-commenter]

Codecov Report

Merging #516 (8c81d12) into main (bdcbb70) will decrease coverage by 0.22%.
The diff coverage is 47.05%.

❗ Current head 8c81d12 differs from pull request most recent head cec97de. Consider uploading reports for the commit cec97de to get more accurate results

@@            Coverage Diff             @@
##             main     #516      +/-   ##
==========================================
- Coverage   63.88%   63.65%   -0.23%     
==========================================
  Files          25       25              
  Lines        1902     1934      +32     
==========================================
+ Hits         1215     1231      +16     
- Misses        608      624      +16     
  Partials       79       79              

Impacted Files	Coverage Δ
agent/registration/host_registrar.go	15.09% <47.05%> (+15.09%)	⬆️

[sachinkumarsingh092]

LGTM

[sachinkumarsingh092]

LGTM

[sachinkumarsingh092]

LGTM