renaming queued_msgs to tx_queued_msgs. changing the type from uint32_t to
    int32_t

Change-Id: I4ea0eb8c4509fde4ac60c6feab003102c7a34fe4
Signed-off-by: Eyal Salomon <esalomon@mellanox.com>
Added counter rx_queued messages that are submitted to application for io

Change-Id: I65f0d6edb9cd948bafbcf8dc08ae6253798c5932
Signed-off-by: Eyal Salomon <esalomon@mellanox.com>