smbtorture: smb2.bench-oplock no longer exists

smb2.bench-oplock got renamed to smb2.bench.oplock as a separate test
within smb2.bench test suite. Subsequently more tests got added into
smb2.bench. Let's remove the old smb2.bench-oplock entry and re-add
the test suite after checking feasibility of running the independent
tests.

Signed-off-by: Anoop C S <anoopcs@cryptolab.net>

testcases/smbtorture/smbtorture-tests-info.yml

@@ -1,7 +1,6 @@
 ---
 - smb2.rw
 - smb2.read
-- smb2.bench-oplock
 - smb2.check-sharemode
 - smb2.compound_find
 - smb2.connect