ignore api-ref/build directory
ignore api-ref/build directory

Change-Id: I613d428fe6c292a0dc1d37a04cd13f837a402bb0
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack/octavia,openstack/octavia,openstack/octavia