Add support for env var OS_INSECURE to control secure auth with keystone

To force secure auth, set 'export OS_INSECURE='
To force insecure auth, set 'export OS_INSECURE=1'
Currently, only insecure auth will work
If secure auth is forced, certificate would need be provided, support for which
will be added soon

Change-Id: Id17ecf1ad1e43b44354ba132a37cee361c2c2b34
Merge "Add support for env var OS_INSECURE to control secure auth with keystone" into R1.05