fixes for grpcomm rcd/brucks algorithms
pmix: removed pmix_base_direct modex mca parameter, renamed orte_full_modex_cutoff and ompi_hostname_cutoff to direct_modex_cutoff
pmix: fixed ugly bug which caused many strange hangs
fix for multiple spawn test
Fix bugs in PMI configure: set correct include path, fix test command with multiple conditions.
Adding a new OPAL hash table routine. Please read the algorithm description in opal/class/opal_hash_table.c for more precise details on the design and implementation. This algorithm was contributed by David Linden of H.P. in partnership with Mellanox Technologies. This contribution achieves two objectives:

1. It's actually hashing now, whereas the old OPAL hash table was not. Thus, it is a bug fix for and, as such, should be included in the 1.8 series.

2. It is dynamic and can grow and shrink the number of buckets in accordance with job size, whereas the old OPAL hash table had a fixed number of buckets which resulted in poor retrieval performance at large scale.

This scheme has been deployed in the field on very large H.P./Mellanox systems and has been demonstrated to significantly decrease job start-up time (~ 20% improvement) when launching applications directly with srun in SLURM environments. However, neither SLURM nor direct launch are prerequisites to take advantage of this change as any entity that utilizes OPAL hash table objects can benefit (at least partially) from this contribution.
Silence warning
remove GNI_RDMAMODE_FENCE bit in GNI_PostRdma

The GNI_RDMAMODE_FENCE bit was a left over from
async progress work that is not needed at this point
in the gni BTL.  Removing the bit also allows
for the removal of the GNI_CDM_MODE_BTE_SINGLE_CHANNEL
bit from the GNI_CdmCreate call.
btl/ugni: improve the handling of eager get fragments when the btl runs out
of preregistered buffers

Before this change eager gets we retried on each progress loop. This commit
modifies the protocol to only retry eager gets when another eager get has
completed. This commit also cleans up some callback code that is no longer
needed.
btl/vader: missing include
Cleanup the PMI m4 syntax with respect to -a, and look for libpmi* so we can pickup both .a, .la, and whatever other extensions that particular system might use.
Modify Cray PMI check to detect PMI on older systems
Fix a couple of minor issues. Ensure usock isn't used if the session dirs aren't setup. Protect an oddball case where orte_xml_fp is NULL.
coll/sm: fix minor memory leaks
port 4488.1.patch attached in #196 to master
coll/sm: fix an other memory leak
Correctly identify the synonym for orte_direct_modex_cutoff as ompi_hostname_cutoff
Provide a mechanism by which an upstream project can rename the OPAL and ORTE libraries. This is required by projects such as ORCM that have their own ORTE and OPAL libraries in order to avoid library confusion. By renaming their version of the libraries, the OMPI applications can correctly dynamically load the correct one for their build.
Add an attributes parameter to the dstore.open function so we can pass directives to the active storage component. This can, for example, include the backing file info for a new shared memory segment.
Extend the dstore framework to include a new "update_handle" API so the attributes of an existing handle can be changed. We can't just open a new handle as the upper layers won't know where to find the info. :-(
[pmix server] Simplify usock_peer_recv_blocking, removing pmix server specific
operations.