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Openstack Neutron uses Linux network namespaces to create & manage private networks.

from man IP-NETNS:

A network namespace is logically another copy of the network stack, with its own routes, firewall rules, and network devices

In order to ssh login to your instance without floating ip (i.e., having only private ip), you need to use network namespace:

find out your namespace id:

ip netns

login:

ip netns exec qdhcp-6021a3b4-8587-4f9c-8064-0103885dfba2

futher info: http://docs.openstack.org/user-guide/cli_cheat_sheet.html