Support for Ansible Tasks
    
    This patch removes libtaskotron formula format for writing tasks and
    introduces support for running tasks in form of an ansible playbook.
    
    The following parts are removed:
    * task formula handling code
    * remote execution (Paramiko Wrapper)
    * concept of overlord and minion
    * the exitcode directive (hasn't been really used)
    
    When running locally, user is asked for sudo password since tasks are ran
    as root.
    
    https://fedoraproject.org/wiki/Changes/InvokingTestsAnsible
    
    Test Plan:
    $ git clone https://pagure.io/task-rpmlint-ansible
    $ runtask -d -i gzip -t koji_build -a x86_64 task-rpmlint-ansible/run_tests.yml
    $ runtask -d -i gzip -t koji_build -a x86_64 --ssh $IP_ADDRESS --ssh-privkey conf/id_taskotron task-rpmlint-ansible/run_tests.yml
    $ runtask -d -i gzip -t koji_build -a x86_64 --libvirt --ssh-privkey conf/id_taskotron task-rpmlint-ansible/run_tests.yml
    
    Differential Revision: https://phab.qa.fedoraproject.org/D1195