Add clamav_control.md doc

Author: wchen-r7

documentation/modules/auxiliary/scanner/misc/clamav_control.md

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+ClamAV is an open source antivirus engine for detecting trojans, viruses, malare, and other
+malicious threats.
+
+clamav_control takes advantage of a possible misconfiguration in the ClamAV service on release
+0.99.2 if the service is tied to a socket, and allows you fingerprint the version, and being
+able to shut down the service.
+
+## Vulnerable Application
+
+To install ClamAV from Ubuntu:
+
+```
+$ sudo apt-get install clamav clamav-daemon
+$ sudo freshclam
+$ sudo /etc/init.d/clamav-daemon start
+```
+
+## Options
+
+clamav_control comes with two actions:
+
+**VERSION**
+
+This is the default action, and shows you the ClamAV version. Output example:
+
+```
+msf auxiliary(clamav_control) > run
+
+[+] 192.168.1.203:3310    - ClamAV 0.98.7/21772/Wed Jun 22 12:54:15 2016
+```
+
+**SHUTDOWN**
+
+This action allows you to shutdown ClamAV. You can also use the VERSION action again to verify
+whether is service is down or not.