honor the credentials of user admin for encrypt/decrypt (#9194)
honor the credentials of user admin for encrypt/decrypt (#9194)

Fixes #9193
fwessels/minio,aead/minio,donatello/minio,harshavardhana/minio,harshavardhana/minio,aead/minio,fwessels/minio,aead/minio,krisis/minio,vadmeste/minio,NitishT/minio,balamurugana/minio,fwessels/minio,krisis/minio,vadmeste/minio,harshavardhana/minio,harshavardhana/minio,fwessels/minio,NitishT/minio,aead/minio,harshavardhana/minio,aead/minio,aead/minio,donatello/minio,NitishT/minio,harshavardhana/minio,minio/minio,harshavardhana/minio,aead/minio,balamurugana/minio,aead/minio,minio/minio,harshavardhana/minio,NitishT/minio