api: Single putObject can use temporary file always. #703
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This code simplification also addresses bugs which
can arise from issues like #702 where error handling
in multiple conditions is cryptic.
Benefit of this fix is also that we are not going
to buffer memory if there are lot of copy operations,
since our min-part size has increased to 64MB using
bytes buffer may cause each file copy to use 128MB
worth of memory due to
bytes.Buffer
growth strategyused in go standard library.
Incidentally this change fixes #702