dev-python/python-glanceclient: Remove redundant longdesc

Signed-off-by: Michał Górny <[email protected]>

Author: mgorny

dev-python/python-glanceclient/metadata.xml

@@ -9,9 +9,6 @@
     <email>[email protected]</email>
     <name>Openstack</name>
   </maintainer>
-  <longdescription lang="en">
-    This is a client for the OpenStack Glance API.
-  </longdescription>
   <upstream>
     <remote-id type="pypi">python-glanceclient</remote-id>
     <remote-id type="github">openstack/python-glanceclient</remote-id>