JCLOUDS-790: Remove hpcloud-objectstorage

HP will sunset this service on 31 Jan 2016:

http://h30499.www3.hp.com/t5/Grounded-in-the-Cloud/A-new-model-to-deliver-public-cloud/ba-p/6804409
diff --git a/assembly/pom.xml b/assembly/pom.xml
index f7b698d..095193c 100644
--- a/assembly/pom.xml
+++ b/assembly/pom.xml
@@ -215,7 +215,6 @@
                 <feature>jclouds-elastichosts-tor-p</feature>
                 <feature>jclouds-gogrid</feature>
                 <feature>jclouds-go2cloud-jhb1</feature>
-                <feature>jclouds-hpcloud-objectstorage</feature>
                 <feature>jclouds-hpcloud-compute</feature>
                 <feature>jclouds-openhosting-east1</feature>
                 <feature>jclouds-rackspace-cloudloadbalancers-uk</feature>