Bump to 1.8.12-alpha [#135159539]
Bump to 1.8.12-alpha [#135159539]

Signed-off-by: Michelle He <bf0066eec85bb06f35c8cece36f35dacd1653bdc@pivotal.io>

pivotal-cf-experimental/ops-manager-example,pivotal-cf-experimental/ops-manager-example,pivotal-cf-experimental/ops-manager-example,pivotal-cf-experimental/ops-manager-example