Capture warnings into logs

Modules that issue warnings via the python
warnings module result in messages printed
to stderr.

This change results in them being captured
into Cinder logs instead.  This means that
logs from production environments contain
all of the relevant info for debugging
issues.

Change-Id: I16a31e1ef0df824dd513f43fd22d631fa647e004

cinder/cmd/api.py

@@ -20,6 +20,7 @@
 import eventlet
 eventlet.monkey_patch()
 
+import logging as python_logging
 import sys
 
 from cinder import objects
@@ -47,6 +48,7 @@ def main():
     CONF(sys.argv[1:], project='cinder',
          version=version.version_string())
     logging.setup(CONF, "cinder")
+    python_logging.captureWarnings(True)
     utils.monkey_patch()
 
     gmr.TextGuruMeditation.setup_autorun(version)

cinder/cmd/backup.py

@@ -17,6 +17,7 @@
 
 """Starter script for Cinder Volume Backup."""
 
+import logging as python_logging
 import sys
 
 import eventlet
@@ -45,6 +46,7 @@ def main():
     CONF(sys.argv[1:], project='cinder',
          version=version.version_string())
     logging.setup(CONF, "cinder")
+    python_logging.captureWarnings(True)
     utils.monkey_patch()
     gmr.TextGuruMeditation.setup_autorun(version)
     server = service.Service.create(binary='cinder-backup')

cinder/cmd/manage.py

@@ -55,6 +55,7 @@
 from __future__ import print_function
 
 
+import logging as python_logging
 import os
 import sys
 
@@ -554,6 +555,7 @@ def main():
         CONF(sys.argv[1:], project='cinder',
              version=version.version_string())
         logging.setup(CONF, "cinder")
+        python_logging.captureWarnings(True)
     except cfg.ConfigDirNotFoundError as details:
         print(_("Invalid directory: %s") % details)
         sys.exit(2)

cinder/cmd/scheduler.py

@@ -20,6 +20,7 @@
 import eventlet
 eventlet.monkey_patch()
 
+import logging as python_logging
 import sys
 
 from oslo_config import cfg
@@ -45,6 +46,7 @@ def main():
     CONF(sys.argv[1:], project='cinder',
          version=version.version_string())
     logging.setup(CONF, "cinder")
+    python_logging.captureWarnings(True)
     utils.monkey_patch()
     gmr.TextGuruMeditation.setup_autorun(version)
     server = service.Service.create(binary='cinder-scheduler')

cinder/cmd/volume.py

@@ -17,6 +17,7 @@
 
 """Starter script for Cinder Volume."""
 
+import logging as python_logging
 import os
 
 import eventlet
@@ -60,6 +61,7 @@ def main():
     CONF(sys.argv[1:], project='cinder',
          version=version.version_string())
     logging.setup(CONF, "cinder")
+    python_logging.captureWarnings(True)
     utils.monkey_patch()
     gmr.TextGuruMeditation.setup_autorun(version)
     launcher = service.get_launcher()