Execute `before_fork` before balancing jobs

[briandunn]

given I'm using the before_fork hook via -r to load rspec configuration
and that configuration sets example_status_persistence_file_path
and that path contains a file with timing information
when I run flatware rspec -r ./flatware_helper.rb -l
then I see a log message showing more than 0 timed files

Actual:
jobs are not balanced because timing information is not yet loaded