Add option to generate sample conf file.

This patch allows user to use `tox -egenconfig` to directly
generate a sample conf file in etc/cloudpulse/cloudpulse.conf.sample.
This helps in vetting any doubts if the already given conf is
outdated or has incorrect config options.

Change-Id: Ib25b09c838114dd022a28b7b1b5e8d9c190a817b

etc/cloudpulse/cloudpulse-config-generator.conf

@@ -0,0 +1,7 @@
+[DEFAULT]
+output_file = etc/cloudpulse/cloudpulse.conf.sample
+wrap_width = 79
+namespace = cloudpulse
+namespace = oslo.messaging
+namespace = oslo.db
+namespace = keystonemiddleware.auth_token

setup.cfg

@@ -32,6 +32,8 @@ all_files = 1
 [entry_points]
 console_scripts =
 	cloudpulse-server = cloudpulse.cmd.api:main
+oslo.config.opts =
+    cloudpulse = cloudpulse.opts:list_opts
 
 [upload_sphinx]
 upload-dir = doc/build/html

tox.ini

@@ -18,6 +18,9 @@ commands = flake8
 [testenv:venv]
 commands = {posargs}
 
+[testenv:genconfig]
+commands = oslo-config-generator --config-file etc/cloudpulse/cloudpulse-config-generator.conf
+
 [testenv:cover]
 commands = python setup.py test --coverage --testr-args='{posargs}'