Description of problem:

Networkmanager failed to bring up teaming network connection becaused of missing /etc/dbus-1/system.d/teamd.conf in initrd and caused the failure of vmcore dumping to remote fs, 
```
This program is not intended to be run as root.
[    2.599750] team0: Mode changed to "activebackup"
dbus: Failed to acquire org.libteam.teamd.team0: org.freedesktop.DBus.Error.AccessDenied: Request to own name refused by policy
Failed to expose dbus name.
teamd_init() failed.
Failed: Invalid argument
<warn>  [1631932469.1616] device (team0): teamd process 367 quit unexpectedly; failing activation
[    2.439787] NetworkManager[349]: <warn>  [1631932469.1616] device (team0): teamd process 367 quit unexpectedly; failing activation
<info>  [1631932469.1653] device (team0): state change: prepare -> failed (reason 'teamd-control-failed', sys-iface-state: 'managed')
[    2.443744] NetworkManager[349]: <info>  [1631932469.1653] device (team0): state change: prepare -> failed (reason 'teamd-control-failed', sys-iface-state: 'managed')
<info>  [1631932469.1698] manager: NetworkManager state is now DISCONNECTED
[    2.448558] NetworkManager[349]: <info>  [1631932469.1698] manager: NetworkManager state is now DISCONNECTED
<warn>  [1631932469.1740] device (team0): Activation: failed for connection 'team0'
[    2.452532] NetworkManager[349]: <warn>  [1631932469.1740] device (team0): Activation: failed for connection 'team0'
<info>  [1631932469.1781] device (team0): state change: failed -> disconnected (reason 'none', sys-iface-state: 'managed')
```

I notice the upstream dracut doesn't suffer from this issue because the following commit would install /etc/dbus-1/system.d/teamd.conf to initrd,

```
commit a97d2cedcf65a9a2fbff2591171f0163c7d3cb46
Author: Dusty Mabe <dusty>
Date:   Thu Jun 24 14:41:08 2021 -0400

    fix(network-manager): support teaming under NM+systemd
    
    Previously when NM was run without dbus then teaming would come
    up appropriately [1], but now that dbus exists we also need to
    include some supporting infrastructure to allow for it to work
    again.
    
    [1] https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/commit/d689380cfc5734a29b1302d68027190e1a606265

diff --git a/modules.d/35network-manager/module-setup.sh b/modules.d/35network-manager/module-setup.sh
index 0b7d21ae..f8561468 100755
--- a/modules.d/35network-manager/module-setup.sh
+++ b/modules.d/35network-manager/module-setup.sh
@@ -38,6 +38,11 @@ install() {
         inst "$dbussystem"/org.freedesktop.NetworkManager.conf
         inst_multiple nmcli nm-online
 
+        # teaming support under systemd+dbus
+        inst_multiple -o \
+            "$dbussystem"/teamd.conf \
+            "$dbussystemconfdir"/teamd.conf
+
```

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