scsi: scsi_transport_iscsi: modify detected conn err to KERN_ERR

scsi: scsi_transport_iscsi: modify detected conn err to KERN_ERR

Fix for Orabug 29469714 is insufficient.  The goal of fix for
Orabug 29469714 is to print "detected conn error" message
produced by scsi_transport_iscsi module onto console which is
particularly useful when iscsi boot device is used and there
are connection issues.  The fix for Orabug 29469714 falls short
because currently, the default console log level in OL is 4
which means that only log levels less than 4 (KERN_WARNING) will
be printed to console.  This commit modifies the corresponding
printk log level to KERN_ERR (log level 3).

Orabug: 29487790
Signed-off-by: Fred Herard <fred.herard@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>