bitbake: toaster: reduce redundant foreign key lookups

bitbake: toaster: reduce redundant foreign key lookups

Replace redundant foreign key lookups with "with" to improve all
recipes page load time. Do depends pre-lookup in the view class,
and use python itertation instead of filter() all to achieve x16
processing speedup.

[YOCTO #6137]

(Bitbake rev: a68a6dc50c11cc59e7c873414e3e22ac2644dea7)

Signed-off-by: David Reyna <David.Reyna@windriver.com>
Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Conflicts:
	bitbake/lib/toaster/toastergui/views.py
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>