Turn error into warning

[thejsj]

What this PR does

• Turns error into warning

TODO

• Ask @Nathan219 about why this happens

Integration Test

Please follow the guidelines presented in the How to Test an API PR article when setting-up and performing tests.

• [ ] Integration Tested @ commitsh by person_3 on (gamma|epsilon|staging)

[thejsj]

Errors when creating a cluster successfully:

[2017-06-05T20:02:49.081Z] ERROR: api/17 on api-worker: could not populate instance with cluster data (branch="", commit="", environment=runnable-on-prem-1, module=ClusterDataService, method=populateInstanceWithClusterInfo, instanceId=5935b8e85050e11100cdfab1, instanceParentShortHash=null)
    err: {
      "message": "AutoIsolationConfig not found"
    }

[2017-06-05T20:02:49.026Z] ERROR: api/17 on api-worker: could not populate instance with cluster data (branch="", commit="", environment=runnable-on-prem-1, module=ClusterDataService, method=populateInstanceWithClusterInfo, instanceId=5935b8e85050e11100cdfaad, instanceParentShortHash=null)
    err: {
      "message": "AutoIsolationConfig not found"
    }

[2017-06-05T20:02:48.770Z] ERROR: api/17 on api-worker: could not populate instance with cluster data (branch="", commit="", environment=runnable-on-prem-1, module=ClusterDataService, method=populateInstanceWithClusterInfo, instanceId=5935b8e85050e11100cdfa9c, instanceParentShortHash=null)
    err: {
      "message": "AutoIsolationConfig not found"
    }

[2017-06-05T20:02:48.674Z] ERROR: api/17 on api-worker: could not populate instance with cluster data (branch="", commit="", environment=runnable-on-prem-1, module=ClusterDataService, method=populateInstanceWithClusterInfo, instanceId=5935b8e85050e11100cdfa97, instanceParentShortHash=null)
    err: {
      "message": "AutoIsolationConfig not found"
    }

2017-06-05T20:02:48.407Z] ERROR: api/17 on api-worker: could not populate instance with cluster data (branch="", commit="", environment=runnable-on-prem-1, module=ClusterDataService, method=populateInstanceWithClusterInfo, instanceId=5935b8e75050e11100cdfa76, instanceParentShortHash=null)
    err: {
      "message": "AutoIsolationConfig not found"
    }

[2017-06-05T20:02:48.271Z] ERROR: api/17 on api-worker: could not populate instance with cluster data (branch="", commit="", environment=runnable-on-prem-1, module=ClusterDataService, method=populateInstanceWithClusterInfo, instanceId=5935b8e75050e11100cdfa76, instanceParentShortHash=null)
    err: {
      "message": "AutoIsolationConfig not found"
    }

... you get it... (I have full logs avaiable if anyone wants to see them).

[Nathan219]

Yeah, definitely need this