Staging: lustre: lnet: Remove and rename struct typedef lstcon_session_t

This patch gets rid of struct typedef lstcon_session_t as it is not
suggested to use typdefs for structure types. Also drop '_t' from the name.

Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>