ctdb-tests: Clear deleted record via recovery instead of vacuuming

ctdb-tests: Clear deleted record via recovery instead of vacuuming

This test has been flapping because sometimes the record is not
vacuumed within the expected time period, perhaps even because the
check for the record can interfere with vacuuming.  However, instead
of waiting for vacuuming the record can be cleared by doing a
recovery.  This should be much more reliable.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14085
RN: Fix flapping CTDB tests

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Wed Aug 21 13:06:57 UTC 2019 on sn-devel-184