[session] fix arguments default value and promote usage of security_enabled as session method. Closes #2481820 One should use session method rather than direct usage of the context manager of the same name. Fix default argument values for consistency with the context manager: when one omit an argument, meaning is "keep the current value", not "disable security".

#! /bin/sh -e
#

if [ "$1" = remove -o "$1" = upgrade ]; then
  if which install-docs >/dev/null 2>&1; then
    install-docs -r cubicweb-doc
  fi
fi

#DEBHELPER#

exit 0