Function fbas_analyzer::find_symmetric_clusters

pub fn find_symmetric_clusters(fbas: &Fbas) -> Vec<QuorumSet>

Finds groups of nodes (represented as quorum sets) such that all members of the same group have the exact identical quorum set, and the nodes contained in this quorum set are exactly the group of nodes (a symmetric cluster). Once no more such clusters are found, returns the maximum quorum of the remaining nodes. (So, getting a result with more than 1 entry implies that we don't have quorum intersection.)