Closes-Bug: issues: 157 (#158)
Closes-Bug: issues: 157 (#158)

Description: virtualhost service instance deletion is failing because entry in deploymentIpsCache used in BoshDirectorClient is not cleaned when a deployment is deleted.
This fix remoes the entry from deploymentIpsCache when delete deployment is called.
sauravmndl/service-fabrik-broker,sauravmndl/service-fabrik-broker,sauravmndl/service-fabrik-broker,sauravmndl/service-fabrik-broker