toasterui, knotty: don't print taskid followed by taskstring which are now in most...

toasterui, knotty: don't print taskid followed by taskstring which are now in most cases identical

* unify the format how the task is described
* don't show taskid followed by taskstring as the taskstring is
  different only for setscene tasks (by _setscene suffix)
* the duplicated output was introduced by:
  2c88afb   taskdata/runqueue: Rewrite without use of ID indirection
  as reported and confirmed as a bug here:
  http://lists.openembedded.org/pipermail/openembedded-core/2016-June/123148.html
* show:
  NOTE: Running task 541 of 548 (/OE/build/oe-core/openembedded-core/meta/recipes-core/zlib/zlib_1.2.8.bb:do_package)
  instead of much longer:
  NOTE: Running task 541 of 548 (ID: /OE/build/oe-core/openembedded-core/meta/recipes-core/zlib/zlib_1.2.8.bb:do_package, /OE/build/oe-core/openembedded-core/meta/recipes-core/zlib/zlib_1.2.8.bb:do_package)

  and similarly for failed tasks:
  ERROR: Task (virtual:native:/OE/build/oe-core/openembedded-core/meta/recipes-core/zlib/zlib_1.2.8.bb:do_install) failed with exit code '1'
  instead of much longer:
  ERROR: Task virtual:native:/OE/build/oe-core/openembedded-core/meta/recipes-core/zlib/zlib_1.2.8.bb:do_install (virtual:native:/OE/build/oe-core/openembedded-core/meta/recipes-core/zlib/zlib_1.2.8.bb:do_install) failed with exit code '1'

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>