Allow to run the pulling test if there is no ed25519 support.
Test the signed pull only with dummy engine. Fixed tests names.
Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>
After splitting out the common key to secret/public inside the dummy engine we
need to pass the the public key for remote with dummy engine usage.
Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>