4.1 server tests: fix failure of tests on newly checked out pynfs

Fix a regression from 39ede6cc6206 "4.1 server: move nfs4_ops.py to
nfs_ops.py".

Escaped detection for a while as I was only testing preexisting repos
with nfs4_ops.py still lying around.  On a newly checked out repo all
4.1 pynfs tests fail.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
4.1 server tests: fix REBT1

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
nfs4client: add test name as a compound tag

allowes to easy trace tests, e.q: [st_verify.py:_try_mand]

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
group junit like output by filenames

Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>