* first import of Bull specific modifications to HAN

* Cleaning, renaming and compilation fixing Changed all future into han.

* Import BULL specific modifications in coll/tuned and coll/base

* Fixed compilation issues in Han

* Changed han_output to directly point to coll framework output.

* The verbosity MCA parameter was removed as a duplicated of coll verbosity

* Add fallback in han reduce when op cannot commute and ppn are imbalanced

* Added fallback wfor han bcast when nodes do not have the same number of process

* Add fallback in han scatter when ppn are imbalanced

+ fixed missing scatter_fn pointer in the module interface

Signed-off-by: Brelle Emmanuel <emmanuel.brelle@atos.net>
Co-authored-by: a700850 <pierre.lemarinier@atos.net>
Co-authored-by: germainf <florent.germain@atos.net>

Among many other things:
- Fix an imbalance bug in MPI_allgather
- Accept more human readable configuration files. We can now specify
  the collective by name instead of a magic number, and the component
  we want to use also by name.
- Add the capability to have optional arguments in the collective
  communication configuration file. Right now the capability exists
  for segment lengths, but is yet to be connected with the algorithms.
- Redo the initialization of all HAN collectives.

Cleanup the fallback collective support.
- In case the module is unable to deliver the expected result, it will fallback
  executing the collective operation on another collective component. This change
  make the support for this fallback simpler to use.
- Implement a fallback allowing a HAN module to remove itself as
  potential active collective module, and instead fallback to the
  next module in line.
- Completely disable the HAN modules on error. From the moment an error is
  encountered they remove themselves from the communicator, and in case some
  other modules calls them simply behave as a pass-through.

Communicator: provide ompi_comm_split_with_info to split and provide info at the same time
Add ompi_comm_coll_preference info key to control collective component selection

COLL HAN: use info keys instead of component-level variable to communicate topology level between abstraction layers
- The info value is a comma-separated list of entries, which are chosen with
  decreasing priorities. This overrides the priority of the component,
  unless the component has disqualified itself.
  An entry prefixed with ^ starts the ignore-list. Any entry following this
  character will be ingnored during the collective component selection for the
  communicator.
  Example: "sm,libnbc,^han,adapt" gives sm the highest preference, followed
  by libnbc. The components han and adapt are ignored in the selection process.
- Allocate a temporary buffer for all lower-level leaders (length 2 segments)
- Fix the handling of MPI_IN_PLACE for gather and scatter.

COLL HAN: Fix topology handling
 - HAN should not rely on node names to determine the ordering of ranks.
   Instead, use the node leaders as identifiers and short-cut if the
   node-leaders agree that ranks are consecutive. Also, error out if
   the rank distribution is imbalanced for now.

Signed-off-by: Xi Luo <xluo12@vols.utk.edu>
Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>
Signed-off-by: George Bosilca <bosilca@icl.utk.edu>

Conflicts:
	ompi/mca/coll/adapt/coll_adapt_ibcast.c

There was a bug allowing for partial packing of non-data elements (such as loop
and end_loop markers) during the exit condition of a pack/unpack call. This has
basically no meaning. Prevent this bug from happening by making sure the element
point to a data before trying to partially pack it.

Signed-off-by: George Bosilca <bosilca@icl.utk.edu>