treat warnings as errors in release notes build
treat warnings as errors in release notes build

Change-Id: Ia440af605a39b8cb765590f8f080fd2cdfbf2249
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack/ceilometer,openstack/ceilometer