vcc_acl: change compare functions to differentiate cases
This is in preparation of a follow-up commit to merge acl entries and detect supersedes from supernets, but these changes are backwards compatible with the previous CMP() if being used as a comparison function for which only negative, zero and positive result are relevant. The A in CMPA() stands for "adjacent". CMPA() returns -3/3 for left of/right of.
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