Add WWbool.BoolDefaultTrue()

New support in WWbool for booleans that default "true."

Used primarily for NetDev.OnBoot.

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

overlays/wicked/internal/wicked_test.go

@@ -66,7 +66,7 @@ This file is autogenerated by warewulf
   <name>wwnet0</name>
   <link-type>ethernet</link-type>
   <control>
-    <mode>manual</mode>
+    <mode>boot</mode>
   </control>
   <firewall/>
   <link/>
@@ -101,7 +101,7 @@ This file is autogenerated by warewulf
   <name>wwnet1</name>
   <link-type>ethernet</link-type>
   <control>
-    <mode>manual</mode>
+    <mode>boot</mode>
   </control>
   <firewall/>
   <link/>