feature: S3C-2035: KMIP, TLS files from env
feature: S3C-2035: KMIP, TLS files from env

Load in memory the content of the keys and certificats
when the TLS configuration comes from the environment.

scality/S3,scality/S3,scality/S3,scality/S3,scality/S3,scality/S3,scality/S3,scality/S3