unset LD_LIBRARY_PATH for ejabberd packages
unset LD_LIBRARY_PATH for ejabberd packages

When running a recent ejabberd (e.g. 17.04) from the deb
downloaded from ejabberd.im on an older Ubuntu (e.g. 16.04 LTS),
it complains about the Python SSL module not being available
to establish an HTTPS connection. This message is caused by a
library version mismatch and can be eliminated by unsetting
LD_LIBRARY_PATH first. In this case, just call external_cloud.sh
instead of external_cloud.py. Same arguments, same behaviour,
but using the system libraries only.

Having this problem is also indicated by the message

bash: /opt/ejabberd-16.09/lib/linux-x86_64/libtinfo.so.5: no version information available (required by bash)

when running any ejabberd-related program (ejabberdctl,
/etc/init.d/ejabberd start/stop/restart)

jsxc/xmpp-cloud-auth,jsxc/xmpp-cloud-auth,jsxc/xmpp-cloud-auth,jsxc/xmpp-cloud-auth