Fix CampaignReader when a campaign has multiple hosts. Directory indi… #5266

Job	Run time
git_checks	5s
format	30s
macos (macos-13, shared)	5m 32s
windows (win2019, shared, serial)	11m 20s
macos (macos-14, static)	3m 41s
docker (ubuntu-bionic)	7m 34s
windows (win2019, shared, ompi)	18m 30s
CodeQL (cpp)	21m 30s
macos (macos-14, shared)	3m 3s
windows (win2022, shared, serial)	12m 5s
windows (win2022, shared, ompi)	16m 4s
windows (win2022, static, serial, windows-2022, vs2022)	11m 29s
linux_ubuntu (ubuntu20.04, gcc8, shared, mpich)	14m 41s
linux_el8 (el8, icc, mpich)	23m 8s
linux_ubuntu (ubuntu20.04, gcc9, shared, mpich)	17m 48s
linux_el8 (el8, oneapi, mpich)	21m 30s
linux_ubuntu (ubuntu20.04, gcc10, shared, mpich)	17m 49s
linux_ubuntu (ubuntu20.04, gcc11, shared, mpich)	17m 33s
linux_ubuntu (ubuntu20.04, clang6, shared, mpich)	11m 3s
linux_ubuntu (ubuntu20.04, clang10, shared, mpich)	15m 7s
linux_ubuntu (ubuntu20.04, gcc8, ompi)	33m 52s
linux_ubuntu (ubuntu20.04, gcc8, serial)	9m 39s
linux_ubuntu (ubuntu20.04, clang6, ompi)	30m 23s
linux_ubuntu (ubuntu20.04, clang6, serial)	8m 25s
linux_ubuntu (ubuntu20.04, gcc8, static, ompi, build_only)	8m 28s
linux_ubuntu (ubuntu20.04, clang6, static, ompi, build_only)	4m 41s
linux_ubuntu (ubuntu20.04, gcc8, static, serial)	9m 38s
linux_ubuntu (ubuntu22.04, rocm, serial, build_only)	2m 35s
contract (examples)	2m 8s
contract (lammps)	4m 8s
contract (tau)	10m 49s
build_and_test	1s
	6h 14m 49s

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