rpm-ostree-toolbox: Allow users to run all commands without inputs

This patch encompasses several files (of which will be detailed
below) to allow users to run -toolbox commands without additional
commandline switches and only from the configuration file.  It adds
assumptions for finding proper inputs as well as usable fallback
defaults.

* rpm-ostree-toolbox-man
    - Added check for sudo, fail if not
    - Now passing cmd to the classes to help with taskbase conditionals

* treecompose
    - Changed -r (release) to -p (profile) to distinguish between
      the os release and the "stanza" in the configuration file. The
      default setting is now 'DEFAULT'

* imagefactory
    - images (qcow2, etc) are being output'd to outputdir/images
    - -o, -k, --name, --tdl are no longer required
    - Same -r change as treecompose

* installer
    - Same -r change as treecompose
    - -c, -o are no longer required

* taskbase
    - Rec's cmd to be able to conditionally check required inputs
    - profile now is the config.ini stanza
    - release now is the os release, aka release in config.ini
    - detect if -p passed exists, fail otherwise
    - yum_baseurl is now req'd in config.ini or via -b, fallbacks
      removed
    - kickstart fallback is os_name-release.ks
    - tdl fallback is os_name-release.tdl
    - --name is now name from config.ini, unless provided