ERP5/NEO: fix initialization of mysqld datadir when a plugin option is present

Since 10.4, it seems mysql_install_db does not take anymore
BASEDIR/lib/plugin as default value for plugin_dir.

software/neoppod/software-common.cfg

@@ -131,14 +131,15 @@ rendered = ${buildout:parts-directory}/${:_buildout_section_name_}/mysqld.in
 mode = 644
 template =
   inline:{% raw %}#!/bin/sh -e
+  basedir='${mariadb:location}'
   datadir='{{datadir}}'
   [ -e "$datadir" ] || {
     rm -vrf "$datadir.new"
-    '${mariadb:location}/scripts/mysql_install_db' \
+    "$basedir/scripts/mysql_install_db" \
       --defaults-file='{{defaults_file}}' \
       --skip-name-resolve \
       --auth-root-authentication-method=normal \
-      --basedir='${mariadb:location}' \
+      --basedir="$basedir" --plugin_dir="$basedir/lib/plugin" \
       --datadir="$datadir.new"
     mv -v "$datadir.new" "$datadir"
   }
@@ -147,9 +148,7 @@ template =
   {{ variable }} \
   {%-   endfor %}
   {%- endif %}
-  exec '${mariadb:location}/bin/mysqld' \
-    --defaults-file='{{defaults_file}}' \
-    "$@"
+  exec "$basedir/bin/mysqld" --defaults-file='{{defaults_file}}' "$@"
   {% endraw %}
 
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