parentalcontrol: do not add rule for web traffic directed to self

Husaam Mehdirequested to merge
for_parentalcontrol_rule into devel
  • this is not necessary for the functioning of urlfilter, only DNS traffic directed towards the device should be intercepted
  • secondly, this is causing problems sometimes where DNS and HTTP traffic cannot flow if a large file (9MB tested) is downloaded from the device (for example, a urlbundle file), the reason for this is not known yet, but the fix is to not intercept web traffic directed to the DUT

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