Adds initial ceilometerclient testing code

This patch add the initial ceilometerclient testing code:

* meter-list
* resource-list
* alarm-list

Change-Id: I8b3f8b93be7a4ddab8011318b12f3d0910e69d87
Implements: bp add-basic-ceilometer-tests
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 115a2b5..d53dbfc 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -422,6 +422,8 @@
 nova = True
 # Whether or not Heat is expected to be available
 heat = false
+# Whether or not Ceilometer is expected to be available
+ceilometer = True
 # Whether or not horizon is expected to be available
 horizon = True