jenkins: revert edit of existing comment back to create a new comment

Reverting changes related to editing existing comments, going back
to the previous behaviour of always creating new comments in PRs about
CI / Jenkins runs.

This is done primarily due to two things:

* It has broken node-core-utils' ability to check if CI's have been run
* There's not collaborator consensus about editing comments is actually
  better than creating new comments

Future plans for bot PR comments going forward has to be discussed more
thorougly and ensured it doesn't break other automation tools used
by collaborators.

Refs nodejs#228

Author: phillipj

lib/github-comment.js

@@ -1,67 +1,16 @@
 'use strict'
 
 const githubClient = require('./github-client')
-const GQL = require('./github-graphql-client')
-
-const getPRComments = `query getPRComments($owner: String!, $repo: String!, $number: Int!, $cursor: String){
-  repository(owner: $owner, name:  $repo) {
-    pullRequest(number: $number) {
-      comments(first: 20, after:$cursor) {
-        nodes {
-          id
-          body
-          viewerDidAuthor
-        }
-        pageInfo {
-          endCursor
-          hasNextPage
-        }
-      }
-      labels(first: 15) {
-        nodes {
-          name
-        }
-      }
-    }
-  }
-}`
-
-function graphQlIdToRestId (nodeId) {
-  const decoded = Buffer.from(nodeId, 'base64').toString()
-  return decoded.match(/\d+$/)[0]
-}
-
-exports.getFirstBotComment = function getFirstBotComment ({ owner, repo, number }, cursor = null) {
-  return GQL(getPRComments, { owner, repo, number, cursor }).then(data => {
-    const { nodes, pageInfo } = data.repository.pullRequest.comments
-    const firstBotComment = nodes.find(e => e.viewerDidAuthor)
-    if (firstBotComment) {
-      return firstBotComment
-    }
-    if (pageInfo.hasNextPage) {
-      return exports.getFirstBotComment({ owner, repo, number }, pageInfo.endCursor)
-    }
-    return null
-  })
-}
 
 exports.createPrComment = function createPrComment ({ owner, repo, number, logger }, body) {
-  exports.getFirstBotComment({ owner, repo, number, logger }).then((existingComment) => {
-    if (existingComment) {
-      const { id: nodeId, body: oldBody } = existingComment
-      const newBody = `${oldBody}\n${body}`
-      const id = graphQlIdToRestId(nodeId)
-      const updatedComment = { owner, repo, id, body: newBody }
-
-      return githubClient.issues.editComment(updatedComment).catch((err) => {
-        logger.error({ existingComment, updatedComment, err }, 'Error while editing existing comment on GitHub')
-      })
-    }
-
-    return githubClient.issues.createComment({ owner, repo, number, body }).catch((err) => {
-      logger.error(err, 'Error while creating comment on GitHub')
-    })
+  githubClient.issues.createComment({
+    owner,
+    repo,
+    number,
+    body
   }, (err) => {
-    logger.error(err, 'Error while trying to fetch existing bot comment on GitHub')
+    if (err) {
+      logger.error(err, 'Error while creating comment on GitHub')
+    }
   })
 }