Ruslan Ermilov 680c8244a9 - Remove unused includes.
- Minor spelling fixes.
- Make IcmpAliasOut2() really work.

Before this change:

# natd -v -n PUB_IFACE -p 12345 -redirect_address 192.168.1.1 P.P.P.P
natd[87923]: Aliasing to A.A.A.A, mtu 1500 bytes
In  [UDP]  [UDP] X.X.X.X:49562 -> P.P.P.P:50000 aliased to
           [UDP] X.X.X.X:49562 -> 192.168.1.1:50000
Out [ICMP] [ICMP] 192.168.1.1 -> X.X.X.X 3(3) aliased to
           [ICMP] A.A.A.A -> X.X.X.X 3(3)

# tcpdump -n -t -i PUB_IFACE host X.X.X.X and "(udp or icmp)"
tcpdump: listening on PUB_IFACE
X.X.X.X.49562 > P.P.P.P.50000: udp 3
A.A.A.A > X.X.X.X: icmp: A.A.A.A udp port 50000 unreachable

After this change:

# natd -v -n PUB_IFACE -p 12345 -redirect_address 192.168.1.1 P.P.P.P
natd[89360]: Aliasing to A.A.A.A, mtu 1500 bytes
In  [UDP]  [UDP] X.X.X.X:49563 -> P.P.P.P:50000 aliased to
           [UDP] X.X.X.X:49563 -> 192.168.1.1:50000
Out [ICMP] [ICMP] 192.168.1.1 -> X.X.X.X 3(3) aliased to
           [ICMP] P.P.P.P -> X.X.X.X 3(3)

# tcpdump -n -t -i PUB_IFACE host X.X.X.X and "(udp or icmp)"
tcpdump: listening on PUB_IFACE
X.X.X.X.49563 > P.P.P.P.50000: udp 3
P.P.P.P > X.X.X.X: icmp: P.P.P.P udp port 50000 unreachable
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