inventory: check if postgres data exist in the sos
inventory: check if postgres data exist in the sos

In case the sosreport doesn't contain the postgres data,
exit and provide a message to users.

Change-Id: Ia01aa082a8dbb777b872b992fc050ab7ac7ebf1d
Signed-off-by: Douglas Schilling Landgraf <cb5f9630225b7afa1e13760d30868c8ce876fc60@redhat.com>

oVirt/ovirt-log-collector,oVirt/ovirt-log-collector,oVirt/ovirt-log-collector