added retry-file command line option

In some cases I need to run  the same playbook with differnet options. In ths case the retry file is overrited.

I added option to specify custom retry file, if not specified, the default is used.

Not I'm able to run these playbook paralel

    ansible-playbook playbook1.yml -e "var1=val1" -r playbook1_val1.retry -l@playbook1_val1.retry
    ansible-playbook playbook1.yml -e "var1=val2" -r playbook1_val2.retry -l@playbook1_val2.retry