Allow disabling of debug logging

I find that enabling the debug log level often causes me to miss
important error messages due to the sheer volume of information
logged.  This change allows configuration of the debug option
in a number of the projects so it can be disabled globally
without having to make one-off changes after each re-stack.

Note that this does not apply to Keystone or Swift right now.
They use a different method to configure their logging level and
I'm not as familiar with them so I didn't want to mess with their
settings.

Change-Id: I185d496543d245a644854c8a37f3359377cb978c
diff --git a/lib/glance b/lib/glance
index 583f879..a18189f 100644
--- a/lib/glance
+++ b/lib/glance
@@ -71,7 +71,7 @@
 
     # Copy over our glance configurations and update them
     cp $GLANCE_DIR/etc/glance-registry.conf $GLANCE_REGISTRY_CONF
-    iniset $GLANCE_REGISTRY_CONF DEFAULT debug True
+    iniset $GLANCE_REGISTRY_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
     inicomment $GLANCE_REGISTRY_CONF DEFAULT log_file
     local dburl=`database_connection_url glance`
     iniset $GLANCE_REGISTRY_CONF DEFAULT sql_connection $dburl
@@ -87,7 +87,7 @@
     iniset $GLANCE_REGISTRY_CONF keystone_authtoken signing_dir $GLANCE_AUTH_CACHE_DIR/registry
 
     cp $GLANCE_DIR/etc/glance-api.conf $GLANCE_API_CONF
-    iniset $GLANCE_API_CONF DEFAULT debug True
+    iniset $GLANCE_API_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
     inicomment $GLANCE_API_CONF DEFAULT log_file
     iniset $GLANCE_API_CONF DEFAULT sql_connection $dburl
     iniset $GLANCE_API_CONF DEFAULT use_syslog $SYSLOG
@@ -123,7 +123,7 @@
     cp -p $GLANCE_DIR/etc/glance-api-paste.ini $GLANCE_API_PASTE_INI
 
     cp $GLANCE_DIR/etc/glance-cache.conf $GLANCE_CACHE_CONF
-    iniset $GLANCE_CACHE_CONF DEFAULT debug True
+    iniset $GLANCE_CACHE_CONF DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
     inicomment $GLANCE_CACHE_CONF DEFAULT log_file
     iniset $GLANCE_CACHE_CONF DEFAULT use_syslog $SYSLOG
     iniset $GLANCE_CACHE_CONF DEFAULT filesystem_store_datadir $GLANCE_IMAGE_DIR/