add faf stats

Forward ported faf-stats-* executables to stats action
    
    supports:
    faf stats --problems
    faf stats --components
    faf stats --trends
    
    How to test:
    
    Add some reports for F20 and run
    
    $ faf stats --debug --components --problems --trends \
    -o fedora --opsys-release 20 --graph --include-low-quality --last 30