lib: allow traps with differently indexed objects

lib: allow traps with differently indexed objects

The function smux_trap only allows the paaasin of one index which is
applied to all indexed objects. However there is a requirement for
differently indexed objects within a singe trap. This commit
introduces a new function smux_trap_multi_index which can be called
with an array of indices. If this array is onf length 1 the original
smux_trap behaviour is maintained. smux_trap now calls the new
function with and index array length of 1 to avoid changes to
existing callers.

Signed-off-by: Pat Ruddy <pat@voltanet.io>