Unable to set Environment variables like *OS_USERNAME, OS_PASSWORD,
OS_TENANT_NAME, OS_REGION_NAME, OS_AUTH_URL* during runtime through for
example os.system("source openrc demo demo") ,in order to run commands for
demo project like ceilometer event-list. Actually I am unable to get demo's
ceilometer events from admin credentials set and could not change to demo
credentials in my logic.
Instead getting error sh: 1: source: not found on executing source openrc
demo demo command
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