LU-2059 tests: skip local config tests only on ZFS

LU-2059 tests: skip local config tests only on ZFS

Only skip conf-sanity.sh (5d, 19b, 21b, 27a) and insanity.sh (2, 4)
when the backing OST filesystem type is ZFS, not for ldiskfs.  The
support for locally-cached config llogs is not implemented for ZFS
yet, so ZFS OSTs cannot be started without the MGS yet.

The ZFS local config support is in progress and these tests will be
re-enabled as part of the landing.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I8c49483401a7132ce09b93aa5d93610c4d500c1e
Reviewed-on: http://review.whamcloud.com/4234
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Li Wei <liwei@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>