allow opting out from infinite upload retries

[kares]

in some cases user might not want to keep on retry-ing upload forever.
the logic makes sense for "transient" errors (e.g. network/service failure) but is potentially problematic (generating a lot of noise at minimum) for arbitrary raises.

we potentially need to investigate the class of exceptions coming from s3 library.

this feature has been requested previously e.g. #169 and #160 ... the later case is specific to Errno::ENOENT which is now handled as a non-retry case #144