core:fkvalidator.sh - some args are not honoured

Adding -l LOGFILE support

Adding support for -v flag
When -v is used the number of violates records and the query how to get
them is displayed.

Example:

./fkvalidator.sh  -u postgres -d engine_964197
Constraint violation found in  event_subscriber (event_up_name)

./fkvalidator.sh  -u postgres -d engine_964197 -v

Constraint violation found in  event_subscriber (event_up_name)
Please run the following SQL to get the 1 violated record/s:
select  (event_up_name)  from event_subscriber where  (event_up_name) IS
NOT NULL and  (event_up_name)  not in (select (event_up_name) from
event_map);
"

Change-Id: I759dc11424bda345e14e7bc7bdf81d41515a0847
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=964197
Signed-off-by: Eli Mesika <emesika@redhat.com>