Description of problem: backup always fails on AWS since OADP 0.5.4. Verified on build  155353 and it was not reproducible.

Severity: Blocker

Version-Release number of selected component (if applicable):

http://registry-proxy.engineering.redhat.com/rh-osbs/iib:157683

How reproducible: Always

Steps to Reproduce:

1. Create DPA and secret:

 oc create secret generic cloud-credentials -n velero --from-file cloud=<creds file>
  kind: DataProtectionApplication
  metadata:
    creationTimestamp: "2022-01-12T15:08:59Z"
    generation: 1
    name: example-velero
    namespace: velero
    resourceVersion: "216427"
    uid: 138d69e4-71c2-4697-990f-9be8f268420f
  spec:
    backupLocations:
    - velero:
        config:
          profile: snapshot
          region: us-east-2
        credential:
          key: cloud
          name: cloud-credentials
        default: true
        objectStorage:
          bucket: mayapvelerooadp
          prefix: velero
        provider: aws
    configuration:
      restic:
        enable: true
      velero:
        defaultPlugins:
        - openshift
        - csi
        - aws
    snapshotLocations:
    - velero:
        config:
          profile: snapshot
          region: us-east-2
        provider: aws
 

1. Create backup of some app and check the result

Actual results: keeps failing with this error:

time="2022-01-12T14:41:35Z" level=error msg="Error getting volume snapshotter for volume snapshot location" backup=velero/backup9 error="rpc error: code = Unknown desc = NoCredentialProviders: no valid providers in chain. Deprecated.\n\tFor verbose messaging see aws.Config.CredentialsChainVerboseErrors" error.file="/remote-source/app/velero-plugin-for-aws/volume_snapshotter.go:66" error.function=main.getSession logSource="pkg/backup/item_backupper.go:449" name=pvc-ffc80f0b-f408-44a5-9656-344ca998447b namespace= persistentVolume=pvc-ffc80f0b-f408-44a5-9656-344ca998447b resource=persistentvolumes volumeSnapshotLocation=example-velero-

Here is the console output after installing 15535 and after installing 157683:

https://privatebin.corp.redhat.com/?031d2d8ee2a121da#BKSRSLnda82FCHED8oAxsyEVWbhbaX19p9cvSyNCdsiD