Land #9933, auxiliary/scanner/db2/discovery docs

documentation/modules/auxiliary/scanner/db2/discovery.md

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+
+## About
+
+This module simply queries the DB2 discovery service for information.
+The discovery service is integrated with the Configuration Assistant and the DB2® administration server.
+Using the discovery method, catalog information for a remote server can be automatically generated in the local database and node directory.
+
+## Verification Steps
+
+1. `use auxiliary/scanner/db2/discovery`
+2. `set RHOSTS [target address range/cidr]`
+3. `set THREDS [number of threads]`
+4. `run`
+
+
+## Scenarios
+- DB2 `9.07.2` running at a `RHEL 6.9` .
+```
+msf auxiliary(scanner/db2/discovery) > set RHOSTS 192.168.1.25
+msf auxiliary(scanner/db2/discovery) > run
+
+[+] Host 192.168.1.25 node name is SERVER02 with a product id of SQL09072
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+
+msf auxiliary(scanner/db2/discovery) > 
+```
+* The same output is expected on other versions of DB2, with the correspondent DB2 version at the product ID.
+  - Example: DB2 9.07.2 outputs the product ID `SQL9072`, while DB2 7.02.9 outputs the product ID `SQL7029`.