Rename Marconi to Zaqar

Due to copyright issues Marconi is renamed to Zaqar. This patch updates
all Marconi references to Zaqar.

Change-Id: Ib37b95d99bbfc666e1a3a17174d87804ecd0649e
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index 9ace4ea..ce0d3af 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -999,9 +999,9 @@
 # value)
 #trove=false
 
-# Whether or not Marconi is expected to be available (boolean
+# Whether or not Zaqar is expected to be available (boolean
 # value)
-#marconi=false
+#zaqar=false
 
 
 [stress]