Print MPI rank in place of locality in --pika:print-bind

[msimberg]

Until now we've been printing the locality in --pika:print-bind but it's always zero. This changes it to print the MPI rank (if pika was compiled with MPI support).

[pika-bot]

Performance test report

pika Performance

Comparison

BENCHMARK	NO-EXECUTOR
Future Overhead - Create Thread Hierarchical - Latch	-

Info

Property	Before	After
pika Commit	02f9de8	b81d631
pika Datetime	2023-08-21T11:44:55+00:00	2023-10-12T10:49:27+00:00
Envfile
Clustername	daint	daint
Hostname	nid01181	nid01183
Datetime	2023-08-21T13:50:51.685166+02:00	2023-10-12T12:55:31.913241+02:00
Compiler	/apps/daint/SSL/pika/spack/lib/spack/env/clang/clang++ 11.0.1	/apps/daint/SSL/pika/spack/lib/spack/env/clang/clang++ 11.0.1

Explanation of Symbols

Symbol	MEANING
=	No performance change (confidence interval within ±1%)
(=)	Probably no performance change (confidence interval within ±2%)
(+)/(-)	Very small performance improvement/degradation (≤1%)
+/-	Small performance improvement/degradation (>10%)
++/--	Large performance improvement/degradation (>10%)
+++/---	Very large performance improvement/degradation (>10%)
?	Probably no change, but quite large uncertainty (confidence interval with ±5%)
??	Unclear result, very large uncertainty (±10%)
???	Something unexpected…

[aurianer]

LGTM thanks!