CLI: fix regression in mirror matches listings
CLI: fix regression in mirror matches listings

Commit 3deb93f1 appears to have introduced a regression by
adding a new _dto field in the base condition class.

The collections of matches in a mirror (and possibly other embedded
condition collections, should they exist) stopped working as a result
because embedded collections where implemented by assigning the usual
dto field directly. The implementation now also assignes the _dto field,
as a lambda, which what BaseCondition expects.

Fixes: MNA-1004
Signed-off-by: Guillermo Ontanon <d2262e90afe20c720e6771813c0217250cb2d4b2@midokura.jp>
Change-Id: Ib50cda5b7c3121d608ce29ae43e4c595e4f9fe2c

celebdor/python-midonetclient,celebdor/python-midonetclient