Modified http_query to use domain_name_cache_lookup.
May help with DNS load issues in HEP.
Modified http_query to use DNS cache.

* ccl/pull/484/head:
  Modified http_query to use domain_name_cache_lookup. May help with DNS load issues in HEP.
Merge branch 'parrot_package' of https://github.com/hmeng-19/cctools into parrot_package
Merge branch 'parrot_package' of https://github.com/hmeng-19/cctools into parrot_package
Merge remote-tracking branch 'origin/parrot_package' into parrot_package
export environment virables safely