Add image names to glance command arguments.

Now a user should specify ID as an image by glance command, and I feel
it is easy-use that a user can specify name also as an image like nova
command(ex. "nova boot").

By applying this patch, a user can specify name as image like the
following examples:

$ glance image-show cirros-0.3.0-x86_64-uec
$ glance image-update --name root-fs cirros-0.3.0-x86_64-uec
$ glance image-delete cirros-0.3.0-x86_64-uec
$ glance image-download cirros-0.3.0-x86_64-uec
$ glance member-create cirros-0.3.0-x86_64-uec 94b0e63a27ca43348fe056622fe3fe94
$ glance member-delete cirros-0.3.0-x86_64-uec 94b0e63a27ca43348fe056622fe3fe94

Fixes bug 1093380

Change-Id: Ia0a070eed6ae3853ef02032f479087edb1d75a67

glanceclient/common/utils.py

@@ -81,12 +81,19 @@ def find_resource(manager, name_or_id):
         pass
 
     # finally try to find entity by name
-    try:
-        return manager.find(name=name_or_id)
-    except exc.NotFound:
+    matches = list(manager.list(filters={'name': name_or_id}))
+    num_matches = len(matches)
+    if num_matches == 0:
         msg = "No %s with a name or ID of '%s' exists." % \
               (manager.resource_class.__name__.lower(), name_or_id)
         raise exc.CommandError(msg)
+    elif num_matches > 1:
+        msg = ("Multiple %s matches found for '%s', use an ID to be more"
+               " specific." % (manager.resource_class.__name__.lower(),
+                               name_or_id))
+        raise exc.CommandError(msg)
+    else:
+        return matches[0]
 
 
 def skip_authentication(f):