ipv4: add 'dhcp_renewal_with_ipv6' test
Check if NM keeps DHCPv4 for connection where IPv6 was done.
https://bugzilla.redhat.com/show_bug.cgi?id=1688329
@rebuild rhel8.2
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Check if NM keeps DHCPv4 for connection where IPv6 was done.
https://bugzilla.redhat.com/show_bug.cgi?id=1688329
@rebuild rhel8.2