packaging: do not use /var/tmp for reportsd

/var/tmp is intended for temporary files.

reportsd is a long-running process, and should not keep its files
there. Use /var/lib/ovirt-engine-reports/jboss_runtime instead.

This is an adaptation of I88563c8c0d319eb3356b47233a31c82d9e8b84c7
which was for the ovirt engine service.

Change-Id: Icc5c730d8944ec686f6025dbacc6cc5118c9b180
Signed-off-by: Yedidyah Bar David <didi@redhat.com>