Remove lifecycle-5.1 job
Remove lifecycle-5.1 job

- vSphere 5.1 has been end-of-lifed August 24, 2016

[#145457253](https://www.pivotaltracker.com/story/show/145457253)

Signed-off-by: Brian Cunnie <c96b911daecac34294af5ecfb5cb3aa7cd7901af@pivotal.io>

cloudfoundry-incubator/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release,cloudfoundry-incubator/bosh-vsphere-cpi-release