[Bug debuginfod/29098] set default prefetch limits to >0

[Noah Sanci]

debuginfod/debuginfod.cxx:
- Added default value to fdcache_prefetch_mds and
  fdcache_prefetch_fds when -R is specified. Defaults   to one half of
  fdcache's values for those respective   variables. These values are only set
  when -R is specified

Note: the ratio of prefetch:fdcache file descriptors and MBs
          is set to 1:2 since the fdcache seems to be used less
          than the standard fdcache.
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