toaster: make clone directory name unique

toaster: make clone directory name unique

Changed naming scheme for clone directory. Used full git url and branch to
make it unique. This should fix the issue with using the same git
repository, but different protocols, e.g. git://some.git.repo and
http://some.git.repo.

[YOCTO #8101]

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>