test/librados: modify LibRadosMiscConnectFailure.ConnectFailure to comply with new...

test/librados: modify LibRadosMiscConnectFailure.ConnectFailure to comply with new seconds unit

The unit type for `client_mount_timeout` was changed from "float" to "secs" in
983b10506dc8466a0e47ff0d320d480dd09999ec. To make this test comply with the new
seconds unit change, we need to change the value to an integer, as seconds
does not accept float values.

Fixes: https://tracker.ceph.com/issues/55971
Signed-off-by: Laura Flores <lflores@redhat.com>
(cherry picked from commit f357459e6b159229ad40491709f756b06a6e87f1)