Merged r1593800 from tomcat/trunk:
Followup to r1593773:
Explicitly create the logs directory.
JUnit fails when the directory where it writes its reports does not exist. It happened at Apache Gump.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1593801 13f79535-47bb-0310-9956-ffa450edef68