Allow to configure maxSwallowSize attribute of an HTTP connector via JMX.
This makes sense when configuring a new connector via JMX.

Merged r1609175 from tomcat/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1609176 13f79535-47bb-0310-9956-ffa450edef68