c-e: avoid setting "full" as default duplex value.
NetworkManager 802-3 link properties have been implemented in: https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=e0c50a97037 'auto-negotiate' default value has been also changed to "false", as together with 'speed' = 0 and duplex unset (NULL) instructs NetworkManager to skip link configuration. Before the implementation, the 'auto-negotiate', 'speed' and 'duplex' 802-3 properties were ignored, without regards of the value they were set. The duplex property in particular was silently set to "full" by c-e for each connection modified. This triggers NetworkManager to force a static link configuration with duplex mode and unspecified speed. [fgiudici@redhat.com: rewritten the commit message]
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