Support specify cluster_id without prefix, Fix #88

[cs-zhang]

Just use cloud_id if cloud_id_prefix is not set.

Signed-off-by: CS Zhang zhangcho@us.ibm.com

[yussufsh]

/lgtm
As cluster_id_prefix has a default value of "test-ocp", user will always need to explicitly set this to "" to truly use this cluster_id only feature.

[yussufsh]

@cs-zhang We will need same change in powervs and kvm projects once this is merged. Thanks.

[bpradipt]

/lgtm
As cluster_id_prefix has a default value of "test-ocp", user will always need to explicitly set this to "" to truly use this cluster_id only feature.

better to document this in the variables file itself to avoid any confusion

[bpradipt]

/lgtm

[ltccci]

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