Update sgml to generate reproducible manpages

Prior to this patch, we failed to recreate bit-by-bit identical
copies of wpa_supplicant because it doesn't generate reproducible manpages.

Since the latest version(0.6.14-3 or new) of docbook-utils have already
support getting the date from sgml file [1], it is possible to make some
progress on the "reproducible builds" effort [2].

[1]: https://sources.debian.org/patches/docbook-utils/0.6.14-3
[2]: https://reproducible-builds.org

Signed-off-by: Hu Keping <hukeping@huawei.com>

wpa_supplicant/doc/docbook/eapol_test.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>eapol_test</refentrytitle>
     <manvolnum>8</manvolnum>

wpa_supplicant/doc/docbook/wpa_background.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_background</refentrytitle>
     <manvolnum>8</manvolnum>

wpa_supplicant/doc/docbook/wpa_cli.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_cli</refentrytitle>
     <manvolnum>8</manvolnum>

wpa_supplicant/doc/docbook/wpa_gui.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_gui</refentrytitle>
     <manvolnum>8</manvolnum>

wpa_supplicant/doc/docbook/wpa_passphrase.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_passphrase</refentrytitle>
     <manvolnum>8</manvolnum>

wpa_supplicant/doc/docbook/wpa_priv.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_priv</refentrytitle>
     <manvolnum>8</manvolnum>

wpa_supplicant/doc/docbook/wpa_supplicant.conf.sgml

@@ -1,5 +1,9 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_supplicant.conf</refentrytitle>
     <manvolnum>5</manvolnum>

wpa_supplicant/doc/docbook/wpa_supplicant.sgml

@@ -1,6 +1,10 @@
 <!doctype refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
 
 <refentry>
+  <refentryinfo>
+    <date>07 August 2019</date>
+  </refentryinfo>
+
   <refmeta>
     <refentrytitle>wpa_supplicant</refentrytitle>
     <manvolnum>8</manvolnum>