Propagated --allow-missing-files to the UBM training

propagating allow missing files

propagating allow missing files

Fixed small bug

Fixed test unit for the allow missing files

Propagated --allow-missing-files to ISV and iVector training and created tests for all combinations

Removed logger

Removed the function is_missing_file

Removed the function is_missing_file
22 jobs for issue-21 in 9 minutes and 55 seconds (queued for 3 seconds)