extensions: libxt_DNAT: rename IPv4 manpage and tell about IPv6 support

This patch renames libipt_DNAT.man to libxt_DNAT.man thus informing
about the IPv6 version, as suggested by Patrick McHardy.

Also, it updates the list of valid protocols for port mapping is
updated to: tcp, udp, dccp and sctp.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_REDIRECT: rename IPv4 manpage and tell about IPv6 support

This patch renames libipt_REDIRECT.man to libxt_REDIRECT.man thus
informing about the IPv6 version.

Also the list of valid protocols for port mapping is updated to:
tcp, udp, dccp and sctp.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_NETMAP: rename IPv4 manpage and tell about IPv6 support

This patch renames libipt_NETMAP.man to libxt_NETMAP.man thus informing
about the IPv6 version.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
extensions: libxt_SNAT: rename IPv4 manpage and tell about IPv6 support

This patch renames libipt_SNAT.man to libxt_SNAT.man thus informing
about the IPv6 version.

Also the list of valid protocols for port mapping is updated to:
tcp, udp, dccp and sctp.

Signed-off-by: Mart Frauenlob <mart.frauenlob@chello.at>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>