Handle differing systemd dbus interface versions

[flaktack]

Currently the dbus code works around having different methods in different systemd versions by catching exceptions, replace it with an actual version check.

systemd-resolved-docker/src/systemd_resolved_docker/resolvedconnector.py

Lines 44 to 71 in b882d10

	try:
	ips = [
	[
	AF_INET if isinstance(ip_port.ip, ipaddress.IPv4Address) else AF_INET6,
	ip_port.ip.packed,
	ip_port.port,
	"",
	]
	for ip_port in self.listen_addresses
	]
	manager = self.if_manager()
	manager.SetLinkDNSEx(self.ifindex, ips)
	manager.SetLinkDNSSEC(self.ifindex, "no")
	manager.SetLinkDomains(self.ifindex, domains)
	except Exception as ex:
	ips = [
	[
	AF_INET if isinstance(ip_port.ip, ipaddress.IPv4Address) else AF_INET6,
	ip_port.ip.packed
	]
	for ip_port in self.listen_addresses
	]
	manager = self.if_manager()
	manager.SetLinkDNS(self.ifindex, ips)
	manager.SetLinkDNSSEC(self.ifindex, "no")
	manager.SetLinkDomains(self.ifindex, domains)