Specify region by name.

Rather than just taking the first region in the array,
specify the name of the region as a string. If the region
is not found, then fallback to the first in the array.

Change-Id: I9f710812cc69a4f4f615ca72483dd58441b3b08a
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 534f3d9..f9fc1d5 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -22,6 +22,8 @@
 # Should typically be left as keystone unless you have a non-Keystone
 # authentication API service
 strategy = keystone
+# The identity region
+region = RegionOne
 
 [compute]
 # This section contains configuration options used when executing tests
@@ -54,6 +56,9 @@
 # The above non-administrative user's tenant name
 alt_tenant_name = alt_demo
 
+# The compute region
+region = RegionOne
+
 # Reference data for tests. The ref and ref_alt should be
 # distinct images/flavors.
 image_ref = {$IMAGE_ID}
@@ -261,6 +266,10 @@
 # this value as "object-store"
 catalog_type = object-store
 
+# The object-store region
+region = RegionOne
+
+
 [boto]
 # This section contains configuration options used when executing tests
 # with boto.