Move neutron_available option to service_available

This commit moves the neutron_available config option from the
network group to under the service_available group. The option
is also renamed to neutron.

Change-Id: I5ee9ec816845de483fe88d76d1bb047e7bb1af7e
diff --git a/etc/tempest.conf.sample b/etc/tempest.conf.sample
index ed98473..54cea5b 100644
--- a/etc/tempest.conf.sample
+++ b/etc/tempest.conf.sample
@@ -209,8 +209,6 @@
 # for each tenant to have their own router.
 public_router_id = {$PUBLIC_ROUTER_ID}
 
-# Whether or not neutron is expected to be available
-neutron_available = false
 
 [volume]
 # This section contains the configuration options used when executing tests
@@ -352,3 +350,5 @@
 [service_available]
 # Whether or not cinder is expected to be available
 cinder = True
+# Whether or not neutron is expected to be available
+neutron = false