Write files generated by buildpack plugin to .cloudfoundry dir

- Write start script, run.pid and tmp dir to .cloudfoundry

- Change name of env variable log to env.log

- Remove unused stop script

- Remove duplicate set of TMPDIR env variable

- Bump java binary buildpack to incorporate change of tmpdir

Change-Id: I382505a13c225ce15380507a05525b14637bbafe
Merge "Write files generated by buildpack plugin to .cloudfoundry dir"