[connection] add logging method on connection
If we are to use this object like we currently do with session, we need to have
the logging method as a lot of code use them.
#! /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