MFC r208407:   Flush all routes before adding the default route in order to allow   sysinstall to cleanly re-initialize the network.
MFC r208407:
  Flush all routes before adding the default route in order to allow
  sysinstall to cleanly re-initialize the network.

PR: bin/145553
Submitted by: gcooper
Approved by: cperciva (mentor)

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