For bindingtester packages, `tail --xml` should still output valid XML

[sfc-gh-satherton]

tail not writing valid XML when the --xml option is used is inconvenient.

Since the bindingtester log is just text currently, perhaps

<BindingTesterResult>
output...
</BindingTesterResult>

or just <Text> as the element name if it can't be determined that the source was the binding tester.

[PierreZ]

Not related to the issue, but how did you generate the tarball for the bindingTester?

[xis19]

@PierreZ A late reply -- you generate the tarball by editing the corresponding CMake files, here it is cmake/AddFdbTest.cmake