Added ReportedAt time for server mode reports - fixes #928

[ahulab]

What did you implement:

Added ReportedAt time for reports submitted from client while server is running in server mode. I know that there is already a PR (#938) open for this, but it doesn't look like it's in progress and this is a fix that is impacting my use of Vuls. I can be active and make changes if requested, please let me know.

Fixes #928

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Yes, see verification steps at the end of the PR

Checklist:

You don't have to satisfy all of the following.

• Write tests

• Write documentation

• Check that there aren't other open pull requests for the same issue/feature
  there is an open pull request, but it doesn't look active: Set ReportedAt as time.Now #938

• Format your source code by make fmt

• Pass the test by make test

• Provide verification config / commands

• Enable "Allow edits from maintainers" for this PR

• Update the messages below

Is this ready for review?: YES

To verify

• Create data.json file in your current directoy

{
  "family": "centos",
  "release": "6.9",
  "runningKernel": {
    "release": "2.6.32-696.6.3.el6.x86_64",
    "version": "",
    "rebootRequired": false
  },
  "packages": {
    "ntp": {
      "name": "ntp",
      "version": "4.2.6p5",
      "release": "10.el6.centos.2",
      "arch": "x86_64"
    },
    "openssh": {
      "name": "openssh",
      "version": "5.3p1",
      "release": "122.el6",
      "arch": "x86_64"
    }
  }
}

• After starting vuls, run these two commands from your CLI, you should see that the time reported is the current time, not the epoch

# json
curl -s -X POST -H "Content-Type: application/json" -d ./data.json http://localhost:5515/vuls | jq '.[] | {reportedAt}'

# text
curl -X POST -H "Content-Type: text/plain" -H "X-Vuls-Server-Name: foo" -H "X-Vuls-OS-Family: centos" -H "X-Vuls-OS-Release: 6.9" -H "X-Vuls-Kernel-Release: 2.6.32-695.20.3.el6.x86_64" --data-binary "" http://localhost:5515/vuls |  jq '.[] | {reportedAt}'

Reference

• https://blog.github.com/2015-01-21-how-to-write-the-perfect-pull-request/

[kotakanbe]

@ahulab Many thanks :)