reset deploy state

[tejal29]

Relates to #2940, #176

Description
Reset Deploy state when a Deploy Trigger is received or via Control API, a deploy request is sent.

Before
skaffold Build from master, run with RPC.

1. cd examples/microservices

skaffold dev --default-repo=gcr.io/tejal-test --auto-deploy=false --enable-rpc -v=debug --port-forward

2. Change a file (only build shd happen)
3. Sent a deploy intent and get the state

$ curl localhost:50052/v1/execute -d '{"deploy": true}' &&  localhost:50052/v1/state | jq
{}  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   453  100   453    0     0   221k      0 --:--:-- --:--:-- --:--:--  221k
{
  "buildState": {
    "artifacts": {
      "gcr.io/tejal-test/gcr.io/k8s-skaffold/leeroy-app": "Complete",
      "gcr.io/tejal-test/gcr.io/k8s-skaffold/leeroy-web": "Complete"
    }
  },
  "deployState": {
    "status": "Complete"
  },
  "forwardedPorts": {
    "9000": {
      "localPort": 9000,
      "remotePort": 8080,
      "namespace": "default",
      "resourceType": "deployment",
      "resourceName": "leeroy-web"
    },
    "50053": {
      "localPort": 50053,
      "remotePort": 50051,
      "namespace": "default",
      "resourceType": "service",
      "resourceName": "leeroy-app"
    }
  }
}

Note: Deploy state is complete.
After

1. skaffold Build from master, run with RPC.

cd examples/microservices
../../out/skaffold dev --default-repo=gcr.io/tejal-test  --auto-deploy=false --enable-rpc -v=debug --port-forward

2. Change a file ( Only Build shd happen)

3. Send a deploy intent and curl the state

tejaldesai@@skaffold (reset-on-deploy)$ curl localhost:50052/v1/execute -d '{"deploy": true}' && curl localhost:50052/v1/state | jq
{}  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   237  100   237    0     0   231k      0 --:--:-- --:--:-- --:--:--  231k
{
  "buildState": {
    "artifacts": {
      "gcr.io/tejal-test/gcr.io/k8s-skaffold/leeroy-app": "Complete",
      "gcr.io/tejal-test/gcr.io/k8s-skaffold/leeroy-web": "Complete"
    }
  },
  "deployState": {
    "status": "Not Started"
  },
  "statusCheckState": {
    "status": "Not Started"
  }
}

Next PRs.
None

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Mentions any output changes.
• Adds documentation as needed: user docs, YAML reference, CLI reference.
• Adds integration tests if needed.

See the contribution guide for more details.

Double check this list of stuff that's easy to miss:

• If you are adding a example to the examples dir, please copy them to integration/examples
• Every new example added in integration/examples dir, should be tested in integration test

Reviewer Notes

• The code flow looks good.
• Unit test added.
• User facing changes look good.

Release Notes

Describe any user facing changes here so maintainer can include it in the release notes, or delete this block.

[codecov]

Codecov Report

Merging #2945 into master will increase coverage by 0.01%.
The diff coverage is 87.5%.

Impacted Files	Coverage Δ
pkg/skaffold/server/endpoints.go	0% <0%> (ø)	⬆️
pkg/skaffold/runner/dev.go	67.96% <100%> (+0.31%)	⬆️
pkg/skaffold/event/event.go	92.21% <100%> (+0.19%)	⬆️

[priyawadhwa]

LGTM