lxd/networks: Updates doNetworkGet to accept an allNodes argument
lxd/networks: Updates doNetworkGet to accept an allNodes argument

 - Fixes bug where if network has node specific config it is only returned when the request has a target.
 - Populates the Status field with the LocalStatus() value for managed networks when allNodes is false.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

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