Bump lock timeout to 240s.
Bump lock timeout to 240s.

[#141366821](https://www.pivotaltracker.com/story/show/141366821)

Signed-off-by: Shatarupa Nandi <3efeaa499e3e1d586e0cf648346ba222fe46816b@pivotal.io>

barthy1/bosh,barthy1/bosh,barthy1/bosh,barthy1/bosh