Add possibility to provide distributed_available_fn

[justusschock]

What does this PR do?

Fixes #1183

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[codecov]

Codecov Report

Merging #1301 (1fabd66) into master (a42a25a) will increase coverage by 0%.
The diff coverage is 100%.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1301   +/-   ##
======================================
  Coverage      86%     87%           
======================================
  Files         190     190           
  Lines       11118   11121    +3     
======================================
+ Hits         9617    9620    +3     
  Misses       1501    1501