lxd: Delete default network and detach device if lxd-init created them.

Newer versions (3.0.1+) of lxd create the 'lxdbr0' network when
'lxd init --auto' is invoked.

When cloud-init is given a network configuration to pass on to
lxc and that config had no name specified or 'lxdbr0', then cloud-init
would fail to create the network as it already exists.

Similarly, we need to remove the device from the default profile
so that the attach code can work.

Also, add a _lxc method and use it to make sure we're getting the
--force-local flag everywhere.

LP: #1776958

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