* add a new test to build the refguide specifically instead of site
* check for changes to src/main/asciidoc or src/main/xslt and run that test and only that test
* check for changes to the hbase-default.xml file and build the refguide if found (but maybe other tests too)
* fallback to relying on the yetus default for other changes
* fix some missing start_clock entries that cause longer-than-actual reported test time.
Signed-off-by: Mike Drob <mdrob@apache.org>
469b57bba0