socorro-syms: Add support for local repositories

This socorro-syms functionality tries to extract the host name out of the source
code repository origin. This causes problems when the origin is a local
repository.

The solution is to look for the origin in two steps. If the origin in the first
step is a local directory we assume it is a temporary download repository. In
the second step we look for the origin to that download repository and if that
also redirects to a local repository, we provide the absolute path instead of a
Socorro repository link.

Signed-off-by: Daniel Markus <daniel.markus@leica-geosystems.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>