This patch adds a test for cloning with KAS_REPO_REF_DIR. It explicitly tests the case that two repos with a single upstream URI are added and also tests mercurial. Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com> [Jan: ensure Python 3.5 compatibility] Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>