NetworkManager fixes in network.py

A number of changes:
    * Make gateway and nameserver settings be per device
      rather than global.
    * Allow for both GATEWAY and IPV6_DEFAULTGW per device.
    * Store nameservers as DNSx where x is an int starting
      at 1 and incrementing.  For functions that need to
      write out nameserver information (kickstart files or
      resolv.conf), read the nameservers from the device
      settings hash table.
    * Add a bringDeviceUp() function which will call the
      write() method (with no instPath specified) to give us
      a new ifcfg-DEVICE file with the latest settings so
      nm-system-settings will see it and bring the device
      up.  This function may (actually, probably will) need
      expansion to communicate/wait_for NetworkManager.

The bringDeviceUp() function replaces the old isys
dhcpNetDevice() and configNetDevice() functions.

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