Move other-requirements.txt to bindep.txt

The default filename for documenting binary dependencies has been
changed from "other-requirements.txt" to "bindep.txt" with the release
of bindep 2.1.0. While the previous name is still supported, it will
be deprecated.

Move the file around to follow this change.

Note that this change is self-testing, the OpenStack CI infrastructure
will use a "bindep.txt" file to setup nodes for testing.

For more information about bindep, see also:
http://docs.openstack.org/infra/manual/drivers.html#package-requirements
http://docs.openstack.org/infra/bindep/

As well as this announcement:
http://lists.openstack.org/pipermail/openstack-dev/2016-August/101590.html

Change-Id: I38b8760a330a8d4df46fb50b63d6b09eb9d6a579
diff --git a/other-requirements.txt b/bindep.txt
similarity index 100%
rename from other-requirements.txt
rename to bindep.txt