[FIX] packaging: include python3-xlrd in debian package

As the python3-xlrd package is available in Debian stretch and Ubuntu
bionic, there is no reason to not include it in Odoo debian package.

However, it cannot be used in Odoo 11.0 package as it does not exists in
Ubuntu Xenial.

ubuntu package:
https://packages.ubuntu.com/bionic/python3-xlrd

debian package:
https://packages.debian.org/stretch/python3-xlrd

closes odoo/docker#276

closes odoo/odoo#38746

X-original-commit: acf413df14f3206b9c852db98247631f297b7c9c
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

debian/control

@@ -45,6 +45,7 @@ Depends:
  python3-vobject,
  python3-werkzeug,
  python3-xlsxwriter,
+ python3-xlrd,
 Conflicts: tinyerp-server, openerp-server, openerp-web, openerp
 Replaces: tinyerp-server, openerp-server, openerp-web, openerp
 Recommends: