Sync to PMIx v3.0rc and add ext4x

[rhc54]

Sync to the draft rc for PMIx v3.0. Add an external component for PMIx master, which is at v4.0

Signed-off-by: Ralph Castain [email protected]

[rhc54]

MTT results:

+-------------+-----------------+-------------+----------+------+------+----------+------+--------------------------------------------------------------------------+
| Phase       | Section         | MPI Version | Duration | Pass | Fail | Time out | Skip | Detailed report                                                          |
+-------------+-----------------+-------------+----------+------+------+----------+------+--------------------------------------------------------------------------+
| MPI Install | my installation | 4.0.0a1     | 00:00    | 1    |      |          |      | MPI_Install-my_installation-my_installation-4.0.0a1-my_installation.html |
| Test Build  | trivial         | 4.0.0a1     | 00:01    | 1    |      |          |      | Test_Build-trivial-my_installation-4.0.0a1-my_installation.html          |
| Test Build  | ibm             | 4.0.0a1     | 00:43    | 1    |      |          |      | Test_Build-ibm-my_installation-4.0.0a1-my_installation.html              |
| Test Build  | intel           | 4.0.0a1     | 00:01    | 1    |      |          |      | Test_Build-intel-my_installation-4.0.0a1-my_installation.html            |
| Test Build  | java            | 4.0.0a1     | 00:01    | 1    |      |          |      | Test_Build-java-my_installation-4.0.0a1-my_installation.html             |
| Test Build  | orte            | 4.0.0a1     | 00:01    | 1    |      |          |      | Test_Build-orte-my_installation-4.0.0a1-my_installation.html             |
| Test Run    | trivial         | 4.0.0a1     | 00:02    | 2    |      |          |      | Test_Run-trivial-my_installation-4.0.0a1-my_installation.html            |
| Test Run    | ibm             | 4.0.0a1     | 07:15    | 390  | 2    |          |      | Test_Run-ibm-my_installation-4.0.0a1-my_installation.html                |
| Test Run    | spawn           | 4.0.0a1     | 00:07    | 7    |      |          | 1    | Test_Run-spawn-my_installation-4.0.0a1-my_installation.html              |
| Test Run    | loopspawn       | 4.0.0a1     | 05:07    |      | 1    |          |      | Test_Run-loopspawn-my_installation-4.0.0a1-my_installation.html          |
| Test Run    | java            | 4.0.0a1     | 00:00    | 1    |      |          |      | Test_Run-java-my_installation-4.0.0a1-my_installation.html               |
| Test Run    | orte            | 4.0.0a1     | 00:42    | 16   | 3    |          |      | Test_Run-orte-my_installation-4.0.0a1-my_installation.html               |
+-------------+-----------------+-------------+----------+------+------+----------+------+--------------------------------------------------------------------------+