build: spec: require openstack-java-sdk 3.0.1

In order to take advantage of the fix for BZ#1013643 we bump the
openstack dependency to version 3.0.1.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1013643
Change-Id: Iffefcc7f4a214ca3b5cababedc45c92c0806333e
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>