Add example config snippet for authenticating to OpenNebula.

examples/opennebula-auth.conf

@@ -0,0 +1,23 @@
+#
+# Example: how to configure ElastiCluster to use an OpenNebula cloud
+#
+# This example only covers authentication information; you need to complement it
+# with `setup`, `login`, and `cluster` sections.
+#
+# For more details about ElastiCluster's configuration, see:
+# http://elasticluster.readthedocs.io/en/latest/configure.html
+#
+
+[cloud/one]
+provider=opennebula
+
+# comment this out to use the value of the ONE_URL env variable
+endpoint=http://localhost:2633/RPC2
+
+# env vars `ONE_USERNAME` and `ONE_PASSWORD` can be used instead of
+# hard-coded values here; if both `username=` and the env variable
+# `ONE_USERNAME` are unset, then credentials are read from the value
+# pointed to by the environmental variable `ONE_AUTH` or -if that is
+# unset too-, file `~/.one/one_auth`
+username=me
+password=secret