qemu-options: Deprecate -nodefconfig

Since 2012 (commit ba6212d8 "Eliminate cpus-x86_64.conf file") we
have no default config files that would be disabled using
-nodefconfig.  Update documentation and document -nodefconfig as
deprecated.

Cc: Markus Armbruster <armbru@redhat.com>
Acked-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20171004030025.7866-3-ehabkost@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

qemu-doc.texi

@@ -2496,6 +2496,10 @@ would automatically enable USB support on the machine type.
 If using the new syntax, USB support must be explicitly
 enabled via the ``-machine usb=on'' argument.
 
+@subsection -nodefconfig (since 2.11.0)
+
+The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
+
 @section qemu-img command line arguments
 
 @subsection convert -s (since 2.0.0)

qemu-options.hx

@@ -4067,26 +4067,17 @@ Write device configuration to @var{file}. The @var{file} can be either filename
 command line and device configuration into file or dash @code{-}) character to print the
 output to stdout. This can be later used as input file for @code{-readconfig} option.
 ETEXI
-DEF("nodefconfig", 0, QEMU_OPTION_nodefconfig,
-    "-nodefconfig\n"
-    "                do not load default config files at startup\n",
-    QEMU_ARCH_ALL)
-STEXI
-@item -nodefconfig
-@findex -nodefconfig
-Normally QEMU loads configuration files from @var{sysconfdir} and @var{datadir} at startup.
-The @code{-nodefconfig} option will prevent QEMU from loading any of those config files.
-ETEXI
+HXCOMM Deprecated, same as -no-user-config
+DEF("nodefconfig", 0, QEMU_OPTION_nodefconfig, "", QEMU_ARCH_ALL)
 DEF("no-user-config", 0, QEMU_OPTION_nouserconfig,
     "-no-user-config\n"
-    "                do not load user-provided config files at startup\n",
+    "                do not load default user-provided config files at startup\n",
     QEMU_ARCH_ALL)
 STEXI
 @item -no-user-config
 @findex -no-user-config
 The @code{-no-user-config} option makes QEMU not load any of the user-provided
-config files on @var{sysconfdir}, but won't make it skip the QEMU-provided config
-files from @var{datadir}.
+config files on @var{sysconfdir}.
 ETEXI
 DEF("trace", HAS_ARG, QEMU_OPTION_trace,
     "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n"