Backup fails to get created when using a minio backend with base64 encoded certs about backup-restore-operator

[soumyalj]

Tested with master-head(master-c428bc9feb4).
Backup-restore-operator: v0.0.1-rc7
Steps:

1. Install the backup-restore operator using helm chart by specifying S3 minio config details in the values.yml . Do not provide region parameter. Provide the certs in base64 encoded format.

debug: false
global:
  systemDefaultRegistry: ''
image: rancher/backup-restore-operator
pvc: {}
s3: 
  credentialSecretName: miniocreds
  bucketName: rancherbackups
  endpoint: minio.a.b.c.d.xip.io
  endpointCA: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSURHakNDQWdLZ0F3SUJBZ0lKQUpscFM4Skowb2RMTUEwR0NTcUdTSWIzRFFFQkN3VUFNQkl4RURBT0JnTlYKQkFNTUIzUmxjM1F0WTJFd0hoY05NakF3T0RNeE1UazFOakF3V2hjTk1qQXhNRE1
tag: v0.0.1-rc4

helm install backup-restore-operator packages/backup-restore-operator/charts -n cattle-resources-system 

2. Create few rke templates, roles, user in rancher
3. Create a backup min1 in the UI. Verified that backup min1 is created in the minio backend
4. Create another set of rke templates, roles, users in rancher.
5. Create another backup "min2" in the UI. Verify the backup is created in minio
6. Restore to "min1". Restore succeeds and resources created in backup "min1" are available.