export api from common folder

commit commit 0b27dfe04664a0f63928ec24ef8c845a89a8cadb
named "Added support to get connection paramaters at any time"
added three API xio_get_connection_params, xio_set_connection_params
and xio_get_connection_context. This API should be exported to
applicatioms. Fix that.

Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
add listen state to kernel

commit 76d1046269c66b62614f0f3e27c63b7c53d7f008
named "Listening connections wher not shutdown properly when calling
xio_unbind" added a new state XIO_STATE_LISTEN. This state was added
only to the user version. Fix that.

Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
typo fix.

Fix English typo in comment.

Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>
error fixes in mt hello world kernel example.

Fix some errors in mt hellow world kernel example.

Signed-off-by: Shlomo Pongratz <shlomop@mellanox.com>