ldh_middleware role: Make .deb file location configurable
Noe detected issue #22 (closed). This MR will fix that issue.
Basically ldh_middleware role had hard-coded version 0.0.2 of ldh-middleare, so when building the latest ldh-middleware (0.0.3 at the time writing this) applying the playbook didn't work.
I made the location of the .deb file configurable through a variable. The default value is /tmp/ldh-middleware_latest.deb.