classes/utility-tasks: make do_listtasks a little more friendly
* Sort the list so it's at least in some form of logical order. I looked
at sorting by dependencies, but that's a topological sort, and given
no such function is shipped as part of the python standard libraries
it would seem excessive to pull one in just for this. In any case, I'm
not sure that for the data we have this would lead to any particularly
pleasing result.
* Show the doc values as defined in documentation.conf (where present)
as a description
Addresses [YOCTO #4856].
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
