snoop: add page (#3457)

pages/sunos/snoop.md

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+# snoop
+
+> Network packet sniffer.
+> SunOS equivalent of tcpdump.
+
+- Capture packets on a specific network interface:
+
+`snoop -d {{e1000g0}}`
+
+- Save captured packets in a file instead of displaying them:
+
+`snoop -o {{filename}}`
+
+- Display verbose protocol layer summary of packets from a file:
+
+`snoop -V -i {{filename}}`
+
+- Capture network packets that come from a hostname and go to a given port:
+
+`snoop to port {{port}} from host {{hostname}}`
+
+- Capture and show an hex-dump of network packets exchanged between two IP addresses:
+
+`snoop -x0 -p4 {{ip_address_1}} {{ip_address_2}}`