can-utils: Change protocol from git to https

gitorious.org that is hosting can-utils has stopped providing git protocol.
That https is provided instead. This will change protocol to get can-utils
of source code from git to https.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>