Rather than exiting configure with an error, print a warning
if lto-based directives are detected and ignore those flags.
This may help resolve rpm problems.

Signed-off-by: Ralph Castain <rhc@pmix.org>
(cherry picked from commit af25b7c)

When outputting a show_help message that fails to find
the specified topic file, output all locations attempted
so the user can see what was done.

Signed-off-by: Ralph Castain <rhc@pmix.org>
(cherry picked from commit f046625)

Check that we correctly unpublish data for given
persistence levels. Add the pubstress test to
the CI.

Signed-off-by: Ralph Castain <rhc@pmix.org>
(cherry picked from commit b19f050)

The use of PMIX_PREFIX in a spawn request was getting
confused, so add some text clarifying it in pmix_common.h.
```text
(char*) prefix to be used by an app to look for its
PMIx installation on remote nodes. A NULL
value indicates that no prefix is to be given
```
Cleanup the client spawn code to reflect that clarification.
Specifically, we are NOT prefixing the location of the
executable - we are instead asking the host to:

(a) setup the LD_LIBRARY_PATH to start with the prefix/lib
    location, and

(b) push `PMIX_PREFIX=<value given>` into the app's environment
    If the value given is NULL, then we want the host NOT to
    assign any prefix to the app, even if there is a default
    one at their level

Signed-off-by: Ralph Castain <rhc@pmix.org>
(cherry picked from commit fc0a55b)

When we see the OPAL_PREFIX envar, we need to not only
propagate it, but we also need to modify LD_LIBRARY_PATH
accordingly so that the app can find its components.

Signed-off-by: Ralph Castain <rhc@pmix.org>
(cherry picked from commit c445afe)