get rid of some pkgcore warnings

net-firewall/iptables/metadata.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>base-system@gentoo.org</email>
+		<name>Gentoo Base System</name>
+	</maintainer>
+	<use>
+		<flag name="conntrack">Build against <pkg>net-libs/libnetfilter_conntrack</pkg> when enables the connlabel matcher</flag>
+		<flag name="netlink">Build against libnfnetlink which enables the nfnl_osf util</flag>
+		<flag name="nftables">Support nftables kernel interface</flag>
+		<flag name="pcap">Build against <pkg>net-libs/libpcap</pkg> which enables the nfbpf_compile util</flag>
+	</use>
+	<longdescription>
+		iptables is the userspace command line program used to set up, maintain, and
+		inspect the tables of IPv4 packet filter rules in the Linux kernel. It's a
+		part of packet filtering framework which allows the stateless and stateful
+		packet filtering, all kinds of network address and port translation, and is a
+		flexible and extensible infrastructure with multiple layers of API's for 3rd
+		party extensions. The iptables package also includes ip6tables. ip6tables is
+		used for configuring the IPv6 packet filter.
+
+		Note that some extensions (e.g. imq and l7filter) are not included into
+		official kernel sources so you have to patch the sources before installation.
+	</longdescription>
+	<upstream>
+		<remote-id type="cpe">cpe:/a:netfilter_core_team:iptables</remote-id>
+	</upstream>
+</pkgmetadata>