Fx the affinity setting bug when using LCI pp and multiple localities per node

[JiakunYan]

Fixes #6398.

The HPX runtime relies on used_cores_map_ to set the affinity correctly when running multiple localities per node (see runtime_distributed::assign_cores for details). used_cores_map_ maps hostnames to "used cores" and assumes the hostname of all localities on the same node are the same. The hostname is generated using the parcelport::get_locality_name method (I would say the name of this method is misleading).

The previous LCI parcelport used "processor_name+rank" as a locality name, which breaks the assumption of used_cores_map_. This PR fixed this issue.

[StellarBot]

Can one of the admins verify this patch?

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.12%	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1cf717d)	397874	336695	84.62%
Head commit (dd67224)	195085 (-202789)	164856 (-171839)	84.50% (-0.12%)

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6400)	1	1	100.00%

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[hkaiser]

add to whitelist

[hkaiser]

LGTM, thanks!

[hkaiser]

bors merge