[WIP] add ota update RESTful API

[xavier-hou]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line: /kind bug /kind documentation /kind enhancement /kind good-first-issue /kind feature /kind question /kind design /sig ai /sig iot /sig network /sig storage

What this PR does / why we need it:

add ota pod update REST API

1. GET /openyurt.io/v1/pods
2. POST /openyurt.io/v1/namespaces/{ns}/pods/{podname}/update

Which issue(s) this PR fixes:

Related proposal #921

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[openyurt-bot]

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In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line: /kind bug /kind documentation /kind enhancement /kind good-first-issue /kind feature /kind question /kind design /sig ai /sig iot /sig network /sig storage

What this PR does / why we need it:

add ota pod update REST API

1. GET /openyurt.io/v1/pods
2. POST /openyurt.io/v1/namespaces/{ns}/pods/{podname}/update

Which issue(s) this PR fixes:

Related proposal #921

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[codecov[bot]]

Codecov Report

Merging #1004 (100f17a) into master (ba10718) will increase coverage by 0.10%. The diff coverage is 54.12%.

@@            Coverage Diff             @@
##           master    #1004      +/-   ##
==========================================
+ Coverage   47.60%   47.71%   +0.10%     
==========================================
  Files          89       90       +1     
  Lines       12548    12651     +103     
==========================================
+ Hits         5974     6036      +62     
- Misses       6059     6093      +34     
- Partials      515      522       +7     

Flag	Coverage Δ
unittests	47.71% <54.12%> (+0.10%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/yurthub/server/server.go	0.00% <0.00%> (ø)
pkg/yurthub/otaupdate/ota.go	57.84% <57.84%> (ø)
.../daemonpodupdater/daemon_pod_updater_controller.go	39.39% <0.00%> (+1.36%)	:arrow_up:

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[zyjhtangtang]

Are pods allowed to be updated when the cloud edge is disconnected?

[rambohe-ch]

@xavier-hou please fix unit tests error

[rambohe-ch]

/lgtm /approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, xavier-hou

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