make the watcher property optional when skipping consul lock
make the watcher property optional when skipping consul lock

[#149625283]

Signed-off-by: Brandon Shroyer <d370be3f39cb88690ed16d1a7b77debc20949e86@pivotal.io>

cloudfoundry/cf-deployment,emalm/cf-deployment,cloudfoundry/cf-deployment