spec: update spec file and "readme-ifcfg-rh.txt"

Bring in changes from upstream nm-1-44 branch.

NetworkManager.spec

@@ -222,7 +222,7 @@ Requires: libndp >= %{libndp_version}
 %endif
 Obsoletes: NetworkManager < %{obsoletes_device_plugins}
 Obsoletes: NetworkManager < %{obsoletes_ppp_plugin}
-Obsoletes: NetworkManager-wimax < 1.2
+Obsoletes: NetworkManager-wimax < 1:1.2
 %if 0%{?rhel} && 0%{?rhel} == 8
 Suggests: NetworkManager-initscripts-updown
 %endif
@@ -390,7 +390,7 @@ Obsoletes: NetworkManager < %{obsoletes_device_plugins}
 # Team was split from main NM binary between 0.9.10 and 1.0
 # We need this Obsoletes in addition to the one above
 # (git:3aede801521ef7bff039e6e3f1b3c7b566b4338d).
-Obsoletes: NetworkManager < 1.0.0
+Obsoletes: NetworkManager < 1:1.0.0
 %endif
 
 %description team

readme-ifcfg-rh.txt

@@ -29,3 +29,35 @@ Alternatively, to migrate only a specific profile, enter:
 For further details, see:
 * nm-settings-keyfile(5)
 * nmcli(1)
+
+Interface renaming
+==================
+
+Connection profiles stored in ifcfg-rh format support the renaming of
+interfaces via udev. This is done via a helper tool
+/usr/lib/udev/rename_device that is invoked by udev to parse the files
+in /etc/sysconfig/network-scripts; when the HWADDR and DEVICE
+variables are set, the interface that matches the MAC address in
+HWADDR is renamed to the name specified in DEVICE.
+
+Connections in keyfile format don't provide the same integration with
+udev. The renaming of interfaces must be configured directly in udev,
+for example by creating a file:
+
+  /etc/systemd/network/70-rename.link
+
+with content:
+
+  [Match]
+  MACAddress=00:11:22:33:44:56
+
+  [Link]
+  Name=ethernet1
+
+Alternatively, a udev rule can also be used, such as:
+
+  /etc/udev/rules.d/70-interface-names.rules
+
+with content:
+
+  SUBSYSTEM=="net",ACTION=="add",ATTR{address}=="00:11:22:33:44:56",ATTR{type}=="1",NAME="ethernet1"