eal: factorize lcore main loop

eal: factorize lcore main loop

All OS implementations provide the same main loop.
Introduce helpers (shared for Linux and FreeBSD) to handle synchronisation
between main and threads and factorize the rest as common code.
Thread id are now logged as string in a common format across OS.

Note:
- this change also fixes Windows EAL: worker threads cpu affinity was
  incorrectly reported in log.

- libabigail flags this change as breaking ABI in clang builds:
  1 function with some indirect sub-type change:

  [C] 'function int rte_eal_remote_launch(int (void*)*, void*, unsigned
      int)' at eal_common_launch.c:35:1 has some indirect sub-type
      changes:
    parameter 1 of type 'int (void*)*' changed:
      in pointed to type 'function type int (void*)' at rte_launch.h:31:1:
        entity changed from 'function type int (void*)' to 'typedef
          lcore_function_t' at rte_launch.h:31:1
        type size hasn't changed

  This is being investigated on libabigail side.
  For now, we don't have much choice but to waive reports on this symbol.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>