Ticket 49840 - ds-replcheck command returns traceback errors against ldif files having garbage content when run in offline mode
Description: Added a basic check to see if the LDIF files are actually
LDIF files. Also added checks that the database RUV are
present as well.
Reviewed by: spichugi(Thanks!)
(cherry picked from commit 60cb52040704686d9541a2e2eb2765d86cb10af2)