GlideinWMS 2879: Making entry_ls work with RPM and catch exceptions
GlideinWMS 2879: Making entry_ls work with RPM and catch exceptions

- Put extra directory verification in place
-- Now you get error messages instead of an exception for common issues
- Put messages in to set GLIDEIN_FACTORY_DIR env variable
- Made it check if gfactory_dir is in RPM location
-- If it is, modify paths for RPM location
- Also, check to see if the client_log actually exists.
-- If not, print an error (don't crash with exception)

holzman/glideinwms-old,holzman/glideinwms-old,holzman/glideinwms-old