device: leave device up when setting it as unmanaged by user

Before, setting a device to unmanaged causes it to go down and clear
the interface state.

It may be useful to instruct NetworkManager not to touch the device
anymore but leave the current state up. Changing behavior for

  nmcli device set "$DEV" managed no

To get the previous behavior, one has to first disconnect the interface
via

  nmcli device disconnect "$DEV"
  nmcli device set "$DEV" managed no

Note that non-permanent addresses like from DHCP will eventually time
out because NetworkManager stops the DHCP client. When instructing
NetworkManager to let go of the device, you have to take it over in
any way you see fit.

https://bugzilla.redhat.com/show_bug.cgi?id=1371433

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