Fix balancer_attach_compute_node caller and indentation
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Key: LIBCLOUD-126
URL: https://issues.apache.org/jira/browse/LIBCLOUD-126
Project: Libcloud
Issue Type: Improvement
Components: Core
Reporter: Tim Fletcher
Priority: Minor
The call to Driver.balancer_attach_compute_node in
LoadBalancer.attach_compute_node appears to be missing a parameter (itself)
Also fixes the indentation of Driver.balancer_attach_compute_node to be
consistent
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