Network: add fallback option for LinkLocalAddressing property

Systemd.network allows fallback option for LinkLocalAddressing
If "fallback" or "ipv4-fallback" is specified, then an IPv4
link-local address is configured only when DHCPv4 fails.
If "fallback", an IPv6 link-local address is always configured.

Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
Change-Id: I2bff8ae4f147426210752eeddbe85a54d69b3c8e
1 file changed