[Bugs] #2978 Sugar NORM: Remove hierachy-changed signal handlers when not needed

[Sugar Labs Bugs]

#2978: Remove hierachy-changed signal handlers when not needed
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  Reporter:  godiard      |            Owner:  erikos
      Type:  defect       |           Status:  new
  Priority:  Normal       |        Milestone:  Unspecified
 Component:  Sugar        |          Version:  Unspecified
  Severity:  Unspecified  |       Resolution:
  Keywords:               |  Distribution/OS:  Unspecified
Bug Status:  New          |
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Changes (by dnarvaez):

 * priority:  Low => Normal
 * status_field:  Unconfirmed => New

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2978#comment:3>
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