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#38728

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