Track the push performance

[jtaleric]

This change enables us to track the push performance.

This will be indexed into elasticserach in the index: repo-push-timing

To create the index :

DELETE /repo-push-timing
PUT /repo-push-timing
POST _template/repo-push-timing
{
  "index_patterns": ["repo-push-timing"],
  "mappings":{
    "properties":{
      "timestamp": {
        "type": "date"
      },
      "start_time" :{
        "type": "date"
      },
      "end_time" :{
        "type": "date"
      }
    }
  }
}

[kurtismullins]

LGTM