Double check if local .rvmrc is owned by user

When `.rvmrc` is present, check at deb package `postinst` script if `.rvmrc` is owned by related user.

Sometimes (most of times during rvm upgrade) rvm changes owning of user `.rvmrc` to `root`.

Same appears to affect [`rvm-ansible`](https://github.com/rvm/rvm1-ansible/pull/24).