fix build: don't clean out expected-results.log: rename to *.xml

'make clean' as generated by ttcn3_makefilegen removes all *.log files, which
of course cleans out expected-results.log, which should not happen. Since this
is a junit XML file, rename the suffix to .xml.

Change-Id: Ic334f6b758eef865e3a497aa430691a3ae696d25
9 files changed