t/cfg2cmd: ensure tests can pass again

t/cfg2cmd: ensure tests can pass again

the change to use a real diff to check tests, with it's nicer output
for failing cases, failed to ensure that the test system knew if a
case passed - earlier done indirectly by 'is_deeply', thus add a
manual 'pass' call if the tes was OK.
Further, the firs test failing aborted everything, which isn't to
nice, normally it's much more convenient if all test get run and one
can view at the results of all of them. So put the diff in an eval
and fail/note the test manually.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Acked-by: Wolfgang Bumiller <w.bumiller@proxmox.com>