Remove unused configuration variables

* from the config sample
* from the config.py
* from the config template

Change-Id: Ic4c57f8c20d3e4107adc3a64b234fe578c4d899c
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index ed3cf6c..020baa1 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -210,12 +210,8 @@
 [object-storage]
 # This section contains configuration options used when executing tests
 # against the OpenStack Object Storage API.
-# This should be the username of a user WITHOUT administrative privileges
-username = admin
-# The above non-administrative user's password
-password = password
-# The above non-administrative user's tenant name
-tenant_name = admin
+
+# You can configure the credentials in the compute section
 
 # The type of endpoint for an Object Storage API service. Unless you have a
 # custom Keystone service catalog implementation, you probably want to leave
diff --git a/etc/tempest.conf.tpl b/etc/tempest.conf.tpl
index 880a3c1..8ef5b84 100644
--- a/etc/tempest.conf.tpl
+++ b/etc/tempest.conf.tpl
@@ -181,11 +181,8 @@
 # This section contains configuration options used when executing tests
 # against the OpenStack Object Storage API.
 # This should be the username of a user WITHOUT administrative privileges
-username = %USERNAME%
-# The above non-administrative user's password
-password = %PASSWORD%
-# The above non-administrative user's tenant name
-tenant_name = %TENANT_NAME%
+
+# You can configure the credentials in the compute section
 
 # The type of endpoint for an Object Storage API service. Unless you have a
 # custom Keystone service catalog implementation, you probably want to leave
diff --git a/tempest/config.py b/tempest/config.py
index 0ccd4b6..cd41f1c 100644
--- a/tempest/config.py
+++ b/tempest/config.py
@@ -400,21 +400,6 @@
     SECTION_NAME = "object-storage"
 
     @property
-    def username(self):
-        """Username to use for Object-Storage API requests."""
-        return self.get("username", "admin")
-
-    @property
-    def tenant_name(self):
-        """Tenant name to use for Object-Storage API requests."""
-        return self.get("tenant_name", "admin")
-
-    @property
-    def password(self):
-        """API key to use when authenticating."""
-        return self.get("password", "password")
-
-    @property
     def catalog_type(self):
         """Catalog type of the Object-Storage service."""
         return self.get("catalog_type", 'object-store')