In amazon ec2 test, eliminate race condition leading to test failure
In amazon ec2 test, eliminate race condition leading to test failure

The first attempt to open the output file of ec2_sim was failing
periodically due to a race condition. Now, the open attempt is
non-fatal and the first attempt happens a little later.

djw8605/htcondor,zhangzhehust/htcondor,neurodebian/htcondor,djw8605/condor,mambelli/osg-bosco-marco,zhangzhehust/htcondor,djw8605/condor,neurodebian/htcondor,bbockelm/condor-network-accounting,mambelli/osg-bosco-marco,htcondor/htcondor,zhangzhehust/htcondor,mambelli/osg-bosco-marco,neurodebian/htcondor,clalancette/condor-dcloud,mambelli/osg-bosco-marco,djw8605/condor,djw8605/htcondor,djw8605/condor,mambelli/osg-bosco-marco,neurodebian/htcondor,zhangzhehust/htcondor,htcondor/htcondor,htcondor/htcondor,neurodebian/htcondor,zhangzhehust/htcondor,djw8605/htcondor,djw8605/condor,clalancette/condor-dcloud,mambelli/osg-bosco-marco,neurodebian/htcondor,zhangzhehust/htcondor,htcondor/htcondor,djw8605/htcondor,bbockelm/condor-network-accounting,zhangzhehust/htcondor,clalancette/condor-dcloud,mambelli/osg-bosco-marco,clalancette/condor-dcloud,djw8605/htcondor,htcondor/htcondor,mambelli/osg-bosco-marco,djw8605/condor,bbockelm/condor-network-accounting,clalancette/condor-dcloud,djw8605/htcondor,bbockelm/condor-network-accounting,zhangzhehust/htcondor,neurodebian/htcondor,djw8605/htcondor,htcondor/htcondor,bbockelm/condor-network-accounting,djw8605/htcondor,htcondor/htcondor,clalancette/condor-dcloud,zhangzhehust/htcondor,bbockelm/condor-network-accounting,clalancette/condor-dcloud,djw8605/htcondor,bbockelm/condor-network-accounting,bbockelm/condor-network-accounting,neurodebian/htcondor,djw8605/condor,djw8605/condor,neurodebian/htcondor,htcondor/htcondor