Generate config file using oslo-config-generator

... so that we can review the available options more easily.

This also updates tox.ini to reuse the same environment for multiple
targets.

Change-Id: I561ff8a116c5a13784b83ff1450af965e6aff82c

.gitignore

@@ -46,6 +46,8 @@ nosetests.xml
 # Translations
 *.mo
 
+etc/ovn-bgp-agent/*.sample
+
 # Complexity
 output/*.html
 output/*/index.html

etc/oslo-config-generator/bgp-agent.conf

@@ -0,0 +1,8 @@
+[DEFAULT]
+output_file = etc/ovn-bgp-agent/bgp-agent.conf.sample
+wrap_width = 79
+
+namespace = oslo.concurrency
+namespace = oslo.log
+namespace = oslo.privsep
+namespace = ovnbgpagent

tox.ini

@@ -32,6 +32,7 @@ commands =
   stestr run --exclude-regex ".tests.unit" {posargs}
 
 [testenv:cover]
+envdir = {toxworkdir}/shared
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source ovn_bgp_agent --parallel-mode
@@ -43,17 +44,25 @@ commands =
     coverage report --fail-under=82 --skip-covered --omit='ovn_bgp_agent/tests/*,ovn_bgp_agent/privileged/linux_net.py,ovn_bgp_agent/utils/linux_net.py'
 
 [testenv:docs]
+envdir = {toxworkdir}/docs
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:releasenotes]
+envdir = {toxworkdir}/docs
 deps = {[testenv:docs]deps}
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
+envdir = {toxworkdir}/shared
 commands = oslo_debug_helper {posargs}
 
+[testenv:genconfig]
+envdir = {toxworkdir}/shared
+commands =
+    oslo-config-generator --config-file=etc/oslo-config-generator/bgp-agent.conf
+
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.