Remove redundant repository mirantis_openstack_proposed

Currently in respository list mos9.0-proposed from
http://mirror.fuel-infra.org/mos-repos/ubuntu/9.0/ is used and in fact
it have same packages as mos9.0-updates.
There are mos9.0-updates is enough for right deployment

https://github.com/Mirantis/mk-lab-salt-model/pull/185
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