bitbake: toaster: show manifests in their own section of the build dashboard

bitbake: toaster: show manifests in their own section of the build dashboard

In the build dashboard, add a section for manifests to each target,
which will contain the license and package manifests for a target.

As we don't record the package manifest (yet), just move the
license manifest link to that section for now.

(Bitbake rev: 58cb685b567a081834a605530957f165d35fcf5e)

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: bavery <brian.avery@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>