JMeter tests should not use a special version of jmeter.properties by default

**Sebb** ([Bug 59436](https://bz.apache.org/bugzilla//show_bug.cgi?id=59436&redirect=false)):
There is a special version of jmeter.properties which was created for unit tests only.

Originally testfiles/jmetertest.properties was a copy of jmeter.properties with some settings changed to make it possible to run repeatable tests.

However the property files have since diverged, which means that some tests may be running with the wrong settings. Also changes to jmeter.properties that cause changes to behaviour won't be detected.

I think it's time to drop testfiles/jmetertest.properties and fix any problems that may arise by overriding just those settings which need to be overridden for a particular test.

Version: Nightly
Severity: normal
OS: Mac OS X 10.1