Prepare for security-related catalina/tomcat version updates

In preparation for updating tomcat/catalina versions to address
security issues, move catalina/tomcat version numbers to
properties in pom.xml

Change-Id: I619cd7b0cc01dd2437d3d0ff1286e14137dbb3ec
Signed-off-by: Ryan Moats <rmoats@us.ibm.com>
Merge "Prepare for security-related catalina/tomcat version updates"