Init placement before nova

With change I7e1e89cd66397883453935dcf7172d977bf82e84 the placement
service may optionally use its own database. In order for this to
work, however, the ordering of how both nova and placement are
configured and initialized in stack.sh requires careful control.

* nova.conf must be created first
* then placement must make some adjustments to it
* then lib/placement needs to create the placement database
* before nova does a database sync (of both databases)

Otherwise, when the placement_database/connection is defined, the nova
db_sync command will fail because the placement database does not yet
exist. If we try to do a sync before the nova_api database is created
_that_ sync will fail.

This patch adjusts the ordering and also removes a comment that will
no longer be true when I7e1e89cd66397883453935dcf7172d977bf82e84 is
merged.

Change-Id: Id5b5911c04d198fe7b94c7d827afeb5cdf43a076

Author: cdent

lib/placement

@@ -44,8 +44,6 @@ PLACEMENT_UWSGI_CONF=$PLACEMENT_CONF_DIR/placement-uwsgi.ini
 
 # The placement service can optionally use a separate database
 # connection. Set PLACEMENT_DB_ENABLED to True to use it.
-# NOTE(cdent): This functionality depends on some code that is not
-# yet merged in nova but is coming soon.
 PLACEMENT_DB_ENABLED=$(trueorfalse False PLACEMENT_DB_ENABLED)
 
 if is_service_enabled tls-proxy; then
@@ -152,9 +150,9 @@ function create_placement_accounts {
 function init_placement {
     if [ "$PLACEMENT_DB_ENABLED" != False ]; then
         recreate_database placement
-        time_start "dbsync"
-        $NOVA_BIN_DIR/nova-manage --config-file $NOVA_CONF api_db sync
-        time_stop "dbsync"
+        # Database migration will be handled when nova does an api_db sync
+        # TODO(cdent): When placement is extracted we'll do our own sync
+        # here.
     fi
     create_placement_accounts
 }

stack.sh

@@ -894,6 +894,8 @@ if is_service_enabled neutron; then
     stack_install_service neutron
 fi
 
+# Nova configuration is used by placement so we need to create nova.conf
+# first.
 if is_service_enabled nova; then
     # Compute service
     stack_install_service nova
@@ -1184,6 +1186,13 @@ if is_service_enabled cinder; then
     init_cinder
 fi
 
+# Placement Service
+# ---------------
+
+if is_service_enabled placement; then
+    echo_summary "Configuring placement"
+    init_placement
+fi
 
 # Compute Service
 # ---------------
@@ -1202,11 +1211,6 @@ if is_service_enabled nova; then
     init_nova_cells
 fi
 
-if is_service_enabled placement; then
-    echo_summary "Configuring placement"
-    init_placement
-fi
-
 
 # Extras Configuration
 # ====================