Fix cooker log download button

This supersedes https://lists.yoctoproject.org/pipermail/toaster/2015-September/002877.html
(which was a single commit).

* Retrieve a build's log file location directly from the file system, as the one which is available at the time of the BuildStarted event is incorrect.

* Hide the "Download build log" button for builds which fail early (e.g. due to recipe parsing) and consequently have no cooker_log_path.

Changes since 986f6b04b26bba9d01393f8f4ced4e0f4385368a (toaster-next) are in
git://git.yoctoproject.org/poky-contrib, elliot/toaster/wrong_log-8373
http://git.yoctoproject.org/cgit.cgi/poky-contrib/log/?h=elliot/toaster/wrong_log-8373

Related bug: https://bugzilla.yoctoproject.org/show_bug.cgi?id=8373

Elliot Smith (2):
toaster: Manually retrieve log file location from filesystem
toaster: Hide "Download build log" button if log doesn't exist

 bitbake/lib/bb/ui/toasterui.py                     | 31 +++++++++++++++++++++-
 .../toastergui/templates/builddashboard.html       |  4 ++-
 2 files changed, 33 insertions(+), 2 deletions(-)

--
Elliot Smith
Software Engineer
Intel OTC

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