Fix standalone javadoc generation in jdbc-pool using "javadoc" task in build.xml of jdbc-pool.
I doubt anyone uses it. Usually javadocs for the pool are generated from Tomcat-wide <javadoc> task in Tomcat's main build.xml file.

There is a trick: jdbc-pool.xml is transformed into package.html file.
Javadoc tool cannot parse the generated package.html if the page has complex headers, footers, HTML comments.

Merged r1634326 r1634329 from tomcat/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1634330 13f79535-47bb-0310-9956-ffa450edef68
Suppress timestamp comment in generated Javadoc. Such as
<!-- Generated by javadoc (version 1.7.0_65) on Wed Oct 22 09:10:36 EST 2014 -->

Those comments result in one changed line per each HTML file,
which makes the diff between different versions of documentation unnecessary huge.

Documentation:
http://docs.oracle.com/javase/7/docs/technotes/tools/solaris/javadoc.html#standard

Merged r1633500 r1634327 from tomcat/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1634332 13f79535-47bb-0310-9956-ffa450edef68