Feature/cdap default cleanup

cdap-default.xml has two entries duplicated, across redundant sections "Web-App" and "Frontend".  Cleaning this up.

prior to this PR:
```
$ cat cdap-default.xml | grep '<name>' | sed -e 's#^.*<name>##' | sed -e 's#</name>##' | sort | uniq -c | head
   2 dashboard.bind.port
   2 router.server.address
```