Analysis: At fil_spage_get_space there is small change that space
is found from tablespace list but we have not yet created node
for it (and added it to space->chain) and as we hold fil_system
mutex here fil_node_create can't continue.

Fixed by allowing UT_LIST_GET_LEN(space->chain) == 0|| 1 and
introducint two new functions that access filespace list
and before returning space check that node is also created.