Bifrost test bridge init race

[Julia Kreger]

Observed on openstack CI:

2016-12-14 11:41:12.987330 | TASK [bifrost-create-vm-nodes : Verify default network is running] *************
2016-12-14 11:41:12.987462 | task path: /home/jenkins/workspace/gate-bifrost-integration-dhcp-ubuntu-xenial-nv/openstack/bifrost/playbooks/roles/bifrost-create-vm-nodes/tasks/main.yml:70
2016-12-14 11:41:13.067564 | <localhost> ESTABLISH LOCAL CONNECTION FOR USER: jenkins
2016-12-14 11:41:13.067737 | <localhost> EXEC /bin/sh -c '( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520 `" && echo ansible-tmp-1481715673.07-193837246091520="` echo $HOME/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520 `" ) && sleep 0'
2016-12-14 11:41:13.075421 | <localhost> PUT /tmp/tmpHczas3 TO /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520/command
2016-12-14 11:41:13.075961 | <localhost> EXEC /bin/sh -c 'chmod u+x /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520/ /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520/command && sleep 0'
2016-12-14 11:41:13.081755 | <localhost> EXEC /bin/sh -c 'sudo -H -S -n -u root /bin/sh -c '"'"'echo BECOME-SUCCESS-vtruqinnoocmvlaqzsegmprqndhwyrbu; LANG=C.UTF-8 LC_ALL=C.UTF-8 LC_MESSAGES=C.UTF-8 /usr/bin/python /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520/command; rm -rf "/home/jenkins/.ansible/tmp/ansible-tmp-1481715673.07-193837246091520/" > /dev/null 2>&1'"'"' && sleep 0'
2016-12-14 11:41:13.596172 | fatal: [localhost]: FAILED! => {"changed": true, "cmd": "virsh net-info default |grep Active|grep -q yes", "delta": "0:00:00.402686", "end": "2016-12-14 11:41:13.557873", "failed": true, "invocation": {"module_args": {"_raw_params": "virsh net-info default |grep Active|grep -q yes", "_uses_shell": true, "chdir": null, "creates": null, "executable": null, "removes": null, "warn": true}, "module_name": "command"}, "rc": 1, "start": "2016-12-14 11:41:13.155187", "stderr": "", "stdout": "", "stdout_lines": [], "warnings": []}
2016-12-14 11:41:13.596272 | ...ignoring
2016-12-14 11:41:13.604056 |
2016-12-14 11:41:13.604128 | TASK [bifrost-create-vm-nodes : Start default network if not running] **********
2016-12-14 11:41:13.604247 | task path: /home/jenkins/workspace/gate-bifrost-integration-dhcp-ubuntu-xenial-nv/openstack/bifrost/playbooks/roles/bifrost-create-vm-nodes/tasks/main.yml:75
2016-12-14 11:41:13.640804 | <localhost> ESTABLISH LOCAL CONNECTION FOR USER: jenkins
2016-12-14 11:41:13.640972 | <localhost> EXEC /bin/sh -c '( umask 77 && mkdir -p "` echo $HOME/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533 `" && echo ansible-tmp-1481715673.64-262820627029533="` echo $HOME/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533 `" ) && sleep 0'
2016-12-14 11:41:13.648524 | <localhost> PUT /tmp/tmpA7ri12 TO /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533/command
2016-12-14 11:41:13.649058 | <localhost> EXEC /bin/sh -c 'chmod u+x /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533/ /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533/command && sleep 0'
2016-12-14 11:41:13.662809 | <localhost> EXEC /bin/sh -c 'sudo -H -S -n -u root /bin/sh -c '"'"'echo BECOME-SUCCESS-frwnmcqzylxnfyoscoadxyqowsurbyrn; LANG=C.UTF-8 LC_ALL=C.UTF-8 LC_MESSAGES=C.UTF-8 /usr/bin/python /home/jenkins/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533/command; rm -rf "/home/jenkins/.ansible/tmp/ansible-tmp-1481715673.64-262820627029533/" > /dev/null 2>&1'"'"' && sleep 0'
2016-12-14 11:41:13.810856 | fatal: [localhost]: FAILED! => {"changed": true, "cmd": ["virsh", "net-start", "default"], "delta": "0:00:00.020430", "end": "2016-12-14 11:41:13.774477", "failed": true, "invocation": {"module_args": {"_raw_params": "virsh net-start default", "_uses_shell": false, "chdir": null, "creates": null, "executable": null, "removes": null, "warn": true}, "module_name": "command"}, "rc": 1, "start": "2016-12-14 11:41:13.754047", "stderr": "error: Failed to start network default\nerror: error creating bridge interface virbr0: File exists", "stdout": "", "stdout_lines": [], "warnings": []}
2016-12-14 11:41:13.816428 |