report: remove xmlns specifier

report: remove xmlns specifier

By specifying "xmlns=https://git.kernel.org/.../xfstests-dev.git",
this causes XML complaint parsers, such as the one used by the python
junitparser library, to put all of the XML elements into a namespace,
which then causes junitparser to toss its cookies.

This can be worked-around in a test runner script via:

    sed -i.orig -e 's/xmlns=\".*\"//' "$RESULT_BASE/result.xml"

but it's better not to include the xmlns line at all in the first
place, since this may cause other users of fstests who are using
the Python junitparser library a lot of headaches.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>