Added event type 'test'

src/warden-client/doc/README.cesnet

@@ -134,6 +134,8 @@ D. Types of events
    * malware - virus/malware sample
    * copyright - copyright infringement
    * webattack - web application attack
+   * test - clients can use these at will when debugging/testing, these
+            messages will be processed and stored, but ignored later
    * other - the rest, uncategorizable yet
 
    In case of complex scenarios with structured info more events with