Support disabling suspend/resume for compute api

The suspend extension may not be available,
allow it to be disabled.

Change-Id: I6ec48d2903f817334ec94b0baa8ba223d2602d1f
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index eb8d458..28a2d34 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -350,6 +350,10 @@
 # Does the test environment support pausing? (boolean value)
 #pause=true
 
+# Does the test environment support suspend/resume? (boolean
+# value)
+#suspend=true
+
 # Does the test environment support live migration available?
 # (boolean value)
 #live_migration=false