Add functional test for access control (RBAC) with Keystone

This patch adds test cases for PUT, DELETE, GET, HEAD, POST and OPTIONS
requests to accounts, containers and objects using various combinations
of users/projects, roles and/or service tokens.

Change-Id: Iea8141ac74ad949a3ae7fa47fda3135d0f2612f6

test/sample.conf

@@ -58,6 +58,12 @@ password3 = testing3
 # account contains an underscore.
 #service_prefix = SERVICE
 
+# Sixth user is required for access control tests.
+# Account must have a role for reseller_admin_role(keystoneauth).
+#account6 = test
+#username6 = tester6
+#password6 = testing6
+
 collate = C
 
 # Only necessary if a pre-existing server uses self-signed certificate