fix impacket requirement

Change-Id: Ifa5d8dc6d2633018652bff54a65370da33bd2e25
Merge branch 'bp_dev/racksapce-win-resource' of https://github.com/vikomall/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge commit 'refs/changes/42/47042/12' of https://review.openstack.org/openstack/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge branch 'bp/new_clb_design' of https://github.com/rs-randallburt/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge branch 'fiv0hfour' of https://github.com/rs-randallburt/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge branch 'DBaaS_rate_limit' of https://github.com/vikomall/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge commit 'refs/changes/17/55317/4' of https://review.openstack.org/openstack/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge branch 'chef_solo_non_blocking' of https://github.com/andrew-plunk/heat into builds/i1-20131127-g01fb048-aplunk_test_1
Merge branch 'impacket_clone' of https://github.rackspace.com/andr5956/heat into builds/i1-20131127-g01fb048-aplunk_test_1