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Description of problem:
NM is not able to renew a DHCP lease if there is a failure sending a single packet

Version-Release number of selected component (if applicable):
1.22.8

How reproducible:
always

Steps to Reproduce:
1. simulate a failure sending DHCP unicast packets by adding the firewall rule 'iptables -A OUTPUT -p udp --dport 67 -j REJECT'
2. start a DHCP connection

Actual results:
NM is not able to renew the lease and the address expires.

Expected results:
NM keeps trying to send unicast packets; after 7/8 of the lease time
it switches to broadcast packets and successfully rebinds the lease
before the address expires.

Upstream:

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/merge_requests/419

test added:
dhcp_rebind_with_firewall

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1847