Level triggered flag was not set correctly

Signed-off-by: Eyal Salomon <esalomon@mellanox.com>
1. using Level triggered events for rdmacm file descriptor
2. releasing the transport outside the connection handlers
3. lowering the log level for library

Signed-off-by: Eyal Salomon <esalomon@mellanox.com>
raio example update

Signed-off-by: Eyal Salomon <esalomon@mellanox.com>