Fix duplicated osprofile config for registry

Now when generating the config samples of Glance, glance-api.conf,
glance-glare.conf and glance-registry.conf will include duplicated
config options for osprofiler. It's because we're collecting
osprofiler's options at two places: etc/oslo-config-generator and
glance/opts.py. So to remove the duplication and keep consistenty
with the other options format, the patch removes the collecting
from etc/oslo-config-generator.

Change-Id: I45ef0bc8453cb8894dc245b8acf390b9ee0f6bfd

etc/oslo-config-generator/glance-api.conf

@@ -11,4 +11,3 @@ namespace = keystonemiddleware.auth_token
 namespace = oslo.log
 namespace = oslo.middleware.cors
 namespace = oslo.middleware.http_proxy_to_wsgi
-namespace = osprofiler

etc/oslo-config-generator/glance-glare.conf

@@ -7,4 +7,3 @@ namespace = oslo.db.concurrency
 namespace = keystonemiddleware.auth_token
 namespace = oslo.log
 namespace = oslo.middleware.cors
-namespace = osprofiler

etc/oslo-config-generator/glance-registry.conf

@@ -7,4 +7,3 @@ namespace = oslo.db.concurrency
 namespace = oslo.policy
 namespace = keystonemiddleware.auth_token
 namespace = oslo.log
-namespace = osprofiler