Openstack devstack HTTPConnectionPool Connection timed out [Fixed]

Issue
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Exception Value:HTTPConnectionPool(host='10.0.2.15', port=8774): Max retries exceeded with url: /v2/b831390e0cb04f1eafbdd39bfddb7bd6/extensions (Caused by : [Errno 110] Connection timed out)

Issue Hint
========
* You may changed the IP of the VM/System where openstack is running
* Here IP 10.0.2.15 is the old IP of VM/System

Fix
===

1)
Edit "localrc" file and add following lines
##don't download from github again and again
RECLONE=no
##Interface of VM/System, where you see the IP (new IP)
PUBLIC_INTERFACE=eth0

2)
#./unstack.sh
#./stack.sh