ipa-managed-entries requires password with bad password

- Add try/except when trying -p option to catch bad password

https://fedorahosted.org/freeipa/ticket/4089

Reviewed-By: Martin Basti <mbasti@redhat.com>

install/tools/ipa-managed-entries

@@ -88,7 +88,10 @@ def main():
         conn = ipaldap.IPAdmin(host, 636, cacert=CACERT)
 
         if options.dirman_password:
+            try:
                 conn.do_simple_bind(bindpw=options.dirman_password)
+            except errors.ACIError:
+                sys.exit("Invalid credentials")
         else:
             conn.do_sasl_gssapi_bind()
     except errors.ACIError: