Tests are shaky in parallel invocation

Hi,

During preparing Halotools for Guix package index I've noticed that tests randomly fail
when `--numprocess` is provided to activate `pytest-xdist` module for parallel jobs, it's not happaning
with single job.

```
Round 1
FAILED halotools/sim_manager/tests/test_halo_table_cache.py::TestHaloTableCache::test_determine_log_entry_from_fname
FAILED halotools/sim_manager/tests/test_ptcl_table_cache_log_entry.py::TestPtclTableCacheLogEntry::test_scenario4
FAILED halotools/sim_manager/tests/test_ptcl_table_cache.py::TestPtclTableCache::test_add_entry_to_cache_log1
FAILED halotools/sim_manager/tests/test_halo_table_cache.py::TestHaloTableCache::test_remove_entry_from_cache_log
FAILED halotools/sim_manager/tests/test_ptcl_table_cache.py::TestPtclTableCache::test_add_entry_to_cache_log3
FAILED halotools/sim_manager/tests/test_ptcl_table_cache.py::TestPtclTableCache::test_determine_log_entry_from_fname1
FAILED halotools/sim_manager/tests/test_halo_table_cache.py::TestHaloTableCache::test_add_entry_to_cache_log
FAILED halotools/sim_manager/tests/test_halo_table_cache.py::TestHaloTableCache::test_update_cached_file_location
FAILED halotools/sim_manager/tests/test_ptcl_table_cache.py::TestPtclTableCache::test_determine_log_entry_from_fname2
FAILED halotools/sim_manager/tests/test_ptcl_table_cache.py::TestPtclTableCache::test_determine_log_entry_from_fname3
FAILED halotools/sim_manager/tests/test_user_supplied_ptcl_catalog.py::TestUserSuppliedPtclCatalog::test_add_ptclcat_to_cache4
FAILED halotools/sim_manager/tests/test_ptcl_table_cache_log_entry.py::TestPtclTableCacheLogEntry::test_passing_scenario

Round 2
FAILED halotools/sim_manager/tests/test_ptcl_table_cache_log_entry.py::TestPtclTableCacheLogEntry::test_scenario2a
FAILED halotools/sim_manager/tests/test_ptcl_table_cache_log_entry.py::TestPtclTableCacheLogEntry::test_scenario2c
FAILED halotools/sim_manager/tests/test_user_supplied_ptcl_catalog.py::TestUserSuppliedPtclCatalog::test_add_ptclcat_to_cache6
FAILED halotools/sim_manager/tests/test_user_supplied_halo_catalog.py::TestUserSuppliedHaloCatalog::test_add_halocat_to_cache1
```

Inputs:
- python-halotools@0.9.1
- python-cython-next@3.0.8
- python-extension-helpers@1.1.1
- python-pytest@7.1.3
- python-pytest-astropy@0.11.0
- python-setuptools@67.6.1
- python-setuptools-scm@7.1.0
- python-wheel@0.40.0
- python-astropy@6.1.4
- python-beautifulsoup4@4.11.1
- python-cython@0.29.32
- python-h5py@3.8.0
- python-numpy@1.23.2
- python-requests@2.28.1
- python-scipy@1.12.0