Test failures in log4j-taglib

[Mikael Ståldal]

I get a bunch of these errors in log4j-taglib when trying to build 
current master branch locally:

[ERROR] Errors:
[ERROR]   CatchingTagTest.setUp:48 » NoClassDefFound 
javax/servlet/SessionCookieConfig
[ERROR]   CatchingTagTest.setUp:48 » NoClassDefFound 
javax/servlet/SessionCookieConfig
[ERROR]   CatchingTagTest.setUp:48 » NoClassDefFound 
javax/servlet/SessionCookieConfig
[ERROR]   DumpTagTest.setUp:51 » NoClassDefFound 
javax/servlet/SessionCookieConfig
[ERROR]   DumpTagTest.setUp:51 » NoClassDefFound 
javax/servlet/SessionCookieConfig