'Create instance for part of FQDN.
@param subDomain: part of FQDN between "dots"
@param rulesets: rules.Ruleset list that applies for this node in tree'

def __init__(self, subDomain, rulesets, depth):

    self.subDomain = subDomain
    self.rulesets = rulesets
    self.children = {}
    self.gvNode = None
    self.depth = depth
