Glance: Allow configuring default_log_levels

Allow a custom value for 'default_log_levels' to be set for both the
Glance registry and API.

Allows setting 'eventlet.wsgi.server=DEBUG' which is useful for tracking
each HTTP request.

Also allows setting a log level for any middleware etc.

Change-Id: I2a791b707fd91ba2d4ca7217b5189969a110c0c9

elements/glance/README.md

@@ -24,6 +24,8 @@ glance:
         log-file: ''
           - The path of the file to use for logging messages from Glance’s API server.
           - The default is unset, which implies stdout.
+        default-log-levels:
+          - Logging: fine tune default log levels
     registry:
         verbose: False
           - Show more verbose log output (sets INFO log level output)
@@ -32,3 +34,5 @@ glance:
         log-file: ''
           - The path of the file to use for logging messages from Glance’s Registry server.
           - The default is unset, which implies stdout.
+        default-log-levels:
+          - Logging: fine tune default log levels

elements/glance/os-config-applier/etc/glance/glance-api.conf

@@ -40,6 +40,10 @@ notifier_strategy = {{glance.api.notifer-strategy}}
 notifier_strategy = {{glance.notifer-strategy}}
 {{/glance.notifier-strategy}}
 
+{{#glance.api.default-log-levels}}
+default_log_levels = {{glance.api.default-log-levels}}
+{{/glance.api.default-log-levels}}
+
 # New style hierarchic (glance.api) params
 {{#glance.api.log-file}}
 log_file = {{glance.api.log-file}}

elements/glance/os-config-applier/etc/glance/glance-registry.conf

@@ -25,6 +25,10 @@ log_file = {{glance.registry.log-file}}
 log_file = {{glance.log-file}}
 {{/glance.log-file}}
 
+{{#glance.registry.default-log-levels}}
+default_log_levels = {{glance.registry.default-log-levels}}
+{{/glance.registry.default-log-levels}}
+
 bind_host = 0.0.0.0
 bind_port = 9191