* device-src/s3-device.c: Always use the prefix when accessing the
  bucket.
* device-src/s3.c (s3_is_bucket_exists): Add prefix as argument.
* device-src/s3.h (s3_is_bucket_exists): Change prototype.


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/trunk@5543 a8d146d6-cc15-0410-8900-af154a0219e0