toaster: get rid of complicated heuristics

toaster: get rid of complicated heuristics

Removed buildinfohelper code which was trying to guess layer version of
the recipe using build request information. The code caused creation of
duplicated recipes as it resulted in layer version from layer index
instead of returning build layer version. As a result of this Toaster
UI was not showing any information about recipes.

Default approach used to find layer version seems to work much better as
it finds proper layer version. Now toaster will use it as the only
way to find layer version.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: brian avery <avery.brian@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>