Bump src/tests

Bump cloudfoundry/vcap-yeti:
  Alex Suraci and Ruth Byers:
     bump assets ( Travis Unknown )
     un-harness lifecycle spec ( Travis Unknown )
     cleanups, more harness deletion (large app spec) ( Travis Unknown )
     rip the harness out of async staging spec ( Travis Unknown )
     remove worthless tests, add a bunch of tags ( Travis Unknown )
  Julz Friedman and Phan Le:
     Looking for different compile messages in buildpack tests. ( Travis Unknown )
     Use wait while waiting for response from an app using admin buildpack. ( Travis Unknown )
  Sarah Chandler and Tim Labeeuw:
     Fix tests for warden cpi. Remove unused apps ( Travis Unknown )
  Nick Wade:
     Get CLI binaries with https ( Travis Unknown )