Use 'Default' as sample install domain name

The Glance install guide suggests using 'default' as the
user_domain_name and project_domain_name, whereas the Keystone
install guide, which people would be consulting earlier, instructs
the installer to use 'Default'.  Since the name is case-sensitive,
this is causing problems for first-time installers of OpenStack.

Change-Id: Iade47bcd69b7a2a99b990885a0270c962de282a1
Closes-bug: #1747181

doc/source/install/install-debian.rst

@@ -213,8 +213,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS
@@ -278,8 +278,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS

doc/source/install/install-obs.rst

@@ -227,8 +227,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS
@@ -292,8 +292,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS

doc/source/install/install-rdo.rst

@@ -213,8 +213,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS
@@ -278,8 +278,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS

doc/source/install/install-ubuntu.rst

@@ -213,8 +213,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS
@@ -278,8 +278,8 @@ Install and configure components
         auth_url = http://controller:5000
         memcached_servers = controller:11211
         auth_type = password
-        project_domain_name = default
-        user_domain_name = default
+        project_domain_name = Default
+        user_domain_name = Default
         project_name = service
         username = glance
         password = GLANCE_PASS