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* Cleanup and Improve NetUtils This class had many unused methods, inconsistent names and redundant code. This commit cleans up code, renames a few methods and constants. The global/account setting 'api.allowed.source.cidr.list' is set to 0.0.0.0/0,::/0 by default preserve the current behavior and thus allow API calls for accounts from all IPv4 and IPv6 subnets. Users can set it to a comma-separated list of IPv4/IPv6 subnets to restrict API calls for Admin accounts to certain parts of their network(s). This is to improve Security. Should an attacker steal the Access/Secret key of an account he/she still needs to be in a subnet from where accounts are allowed to perform API calls. This is a good security measure for APIs which are connected to the public internet. Signed-off-by: Wido den Hollander <wido@widodh.nl>