Move elastic-recheck shell account out of /var/run

* manifests/site.pp: Expect the SSH key in /home rather than in
/var/run.

* modules/elastic_recheck/manifests/init.pp: Change the recheck
shell account for elastic-recheck to use a homedir in /home.

Change-Id: I43f4a8cdcb803328388b7e92732e5cb9d6acb2a8
Merge "Move elastic-recheck shell account out of /var/run"