Don't allow HTCondor to start if we detect an invalid combination of kernel version, USE_KEYRING_SESSIONS, and USE_CLONE_TO_CREATE_PROCESSES.  #6360
Don't allow HTCondor to start if we detect an invalid combination of kernel version, USE_KEYRING_SESSIONS, and USE_CLONE_TO_CREATE_PROCESSES.  #6360

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor