Make ulimit checks more resilient to OS oddities, and improve error message
Make ulimit checks more resilient to OS oddities, and improve error message

chriskuehl/gsutil-debian,ttiurani/gsutil,dimfeld/gsutil,fishjord/gsutil,craigcitro/gsutil,BrandonY/gsutil,mattdr/gsutil,GoogleCloudPlatform/gsutil,dtjackson/gsutil,GoogleCloudPlatform/gsutil