Use ServiceLoader and define
org.eclipse.jgit.transport.DefaultSshSessionFactory in
META-INF/services/org.eclipse.jgit.transport.SshSessionFactory so that
the legacy behavior is still the same.
Bug: 553625
Change-Id: Id1a65506140d921ed76d83699e3817f0d2ca08ed
Signed-off-by: Emmanuel Hugonnet <ehugonne@redhat.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>