Move cert issuer query into its own function
Move cert issuer query into its own function

brianhlin/htcondor-ce,opensciencegrid/htcondor-ce,matyasselmeci/htcondor-ce,opensciencegrid/htcondor-ce,matyasselmeci/htcondor-ce,brianhlin/htcondor-ce,matyasselmeci/htcondor-ce,brianhlin/htcondor-ce,opensciencegrid/htcondor-ce