Description of problem:

Clone of the fix for 5.6 and 5.7

After updating the openshift logging operator from channel stable-5.5, the operator is mounting all secrets with AWS role ARN to the same collector-sts-token volume which makes it non-unique.

How reproducible:

Customer is using fluentd & forwarding logs from namespaces to CloudWatch from an STS enabled cluster (not using ES)

Steps to Reproduce:

1. deploy STS enabled cluster
2.  install CLO 5.8
3. successfully deploy ClusterLogForwarding from CloudWatch using fluentd 

Actual results:

Multiple roles are no longer authenticated 

Expected results:

Work the same as in the 5.5 version, allowing multiple roles to authenticate