Detection outputs log messages and should be silent

[nebhale]

Currently the npm buildpack prints output to stdout:

[detector] Trying group of 5...
[detector] ======== Output: NPM Buildpack ========
[detector] no "package.json" found at: /workspace/app/package.json
[detector] ======== Results ========
[detector] Node.js Buildpack: pass
[detector] Python Buildpack: pass
[detector] NPM Buildpack: fail
[detector] Node Function Buildpack: fail
[detector] Pivotal New Relic Buildpack: skip
[detector] Trying group of 4...
[detector] ======== Output: NPM Buildpack ========
[detector] no "package.json" found at: /workspace/app/package.json
[detector] ======== Results ========
[detector] Node.js Buildpack: pass
[detector] Python Buildpack: pass
[detector] NPM Buildpack: fail
[detector] Pivotal New Relic Buildpack: skip
[detector] Trying group of 1...
[detector] ======== Results ========
[detector] Command Function Buildpack: pass

This output is unnecessary and should only be output as debug logging.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/164991430

The labels on this github issue will be updated when the story is started.

[ndon55555]

@nebhale Should be fixed on this commit now