Adding/Removing instances from targetpool requires a list. This fixes a bug with attaching/detaching nodes from loadbalancers. (Attach/Detach wasn't working)
Adding/Removing instances from targetpool requires a list. This fixes a bug with attaching/detaching nodes from loadbalancers. (Attach/Detach wasn't working)

Closes #228.

Signed-off-by: Tomaz Muraus <bb4af54d4692022d34bcf290dffd91d21e083d18@apache.org>

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