ipv4: add 'ipv4_restore_default_route_externally' test
Check that NM is OK with externally readded default route as it always was.
https://bugzilla.redhat.com/show_bug.cgi?id=1503769
@Build:nm-1-10
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Check that NM is OK with externally readded default route as it always was.
https://bugzilla.redhat.com/show_bug.cgi?id=1503769
@Build:nm-1-10