Replace "regionOne" with "RegionOne"

This fixes an inconsistency between the install guide
and other OpenStack components, which names the first region in Camel Case.

Change-Id: I80a1827e9008777e73dce1dd3a95ece5dd614744
Related-Change: I8f47be1b4b43defb86b4da2a34c5f40494361045

doc/install-guide/section_ceilometer-controller.xml

@@ -173,7 +173,7 @@ Repeat User Password:
   --publicurl http://<replaceable>controller</replaceable>:8777 \
   --internalurl http://<replaceable>controller</replaceable>:8777 \
   --adminurl http://<replaceable>controller</replaceable>:8777 \
-  --region regionOne \
+  --region RegionOne \
   metering</userinput>
 <computeroutput>+--------------+----------------------------------+
 | Field        | Value                            |
@@ -182,7 +182,7 @@ Repeat User Password:
 | id           | d3716d85b10d4e60a67a52c6af0068cd |
 | internalurl  | http://controller:8777           |
 | publicurl    | http://controller:8777           |
-| region       | regionOne                        |
+| region       | RegionOne                        |
 | service_id   | 3405453b14da441ebb258edfeba96d83 |
 | service_name | ceilometer                       |
 | service_type | metering                         |
@@ -315,7 +315,7 @@ os_username = ceilometer
 os_tenant_name = service
 os_password = <replaceable>CEILOMETER_PASS</replaceable>
 os_endpoint_type = internalURL
-os_region_name = regionOne</programlisting>
+os_region_name = RegionOne</programlisting>
           <para>Replace <replaceable>CEILOMETER_PASS</replaceable> with
             the password you chose for the <literal>ceilometer</literal>
             user in the Identity service.</para>