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the output of `#brclt show` shows that your br100 is not bridged on any nic
and the output of `ifconfig` shows that your br100 get no ipv4 addr

br100 plays roles of:
1) gateway
2) dhcp server
3) dns server

so since your br100 is not created correctly, i think the vm will not
get an ip trough dhcp

please paste your nova.conf file, especially the network part. hope
someone will find the problem