Update network interface bonding configuration and documentation

- Closes: #1482
- Closes: #1280

This also corrects poor handling of whitespace around the "file" function
throughout the templates, given experiences with the network templates while
implementing the bond behavior. Since the file function actually does produce
output (that is parsed by Warewulf itself) it should not collaps prefix
whitespace.

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

userdocs/contents/nodeconfig.rst

@@ -204,17 +204,6 @@ image and network:
   We recommend the use of the original predictable names assigned to the interfaces (`eno1, ...`),
   as otherwise an interface may remain unconfigured if its name conflicts with the name of an already existing interface during boot.
 
-To configure a bonded (link aggregation) network interface the following commands can be used:
-
-.. code-block:: console
-
-  # wwctl node set --netname=bond0_member_1 --netdev=eth2 --type=bond-slave n001
-  # wwctl node set --netname=bond0_member_2 --netdev=eth3 --type=bond-slave n001
-  # wwctl node set --netname=bond0 --netdev=bond0 --onboot=true --type=bond --ipaddr 10.0.3.1 --netmask=255.255.255.0 --mtu=9000 n001
-
-Note: the netnames of the member interterfaces need to match the "netname" of the bonded interface until the first "_" (in the example bond0)
-
-
 Additional networks
 -------------------
 
@@ -232,6 +221,32 @@ You will have provide all the necessary network information.
      --type infiniband \
      n001
 
+Bonding
+-------
+
+Support for bonded / link aggregation network interfaces depends on the network overlay being used.
+
+The ``ifcfg`` and ``NetworkManager`` overlays can configure a network bond like this:
+
+.. code-block:: yaml
+
+   network devices:
+     bond0:
+       type: Bond
+       device: bond0
+       ipaddr: 192.168.3.100
+       netmask: 255.255.255.0
+   en1:
+     device: en1
+     hwaddr: e6:92:39:49:7b:03
+     tags:
+       master: bond0
+   en2:
+     device: en2
+     hwaddr: 9a:77:29:73:14:f1
+     tags:
+       master: bond0
+
 VLAN
 ----
 

userdocs/contents/overlays.rst

@@ -312,7 +312,7 @@ more than once in a template to write content to multiple files.
 
    {{- range $devname, $netdev := .NetDevs }}
    {{- $filename := print "ifcfg-" $devname ".conf" }}
-   {{- file $filename }}
+   {{ file $filename }}
    {{/* content here */}}
    {{- end }}
 

userdocs/contents/templating.rst

@@ -87,7 +87,7 @@ The following template will create a file called
   {{- $source := .BuildSource }}
   {{range $devname, $netdev := .NetDevs -}}
   {{- $filename := print "ifcfg-" $devname ".xml" }}
-  {{- file $filename }}
+  {{ file $filename }}
   <!--
   This file is autogenerated by warewulf
   Host:   {{ $host }}