Set the hardcoded minimum for retire_time as 600 + fixed typo
Set the hardcoded minimum for retire_time as 600 + fixed typo

- Set retire time to be a variable so I can change it easily for testing
- Hardcoded it back to 600
- Also fixed bug reported by Igor:
-- In x509 proxy check,
-- let       "retire_time=$die_time - $reduce_time"
-- should be "retire_time=$retire_time - $reduce_time"

bbockelm/glideinWMS,bbockelm/glideinWMS,bbockelm/glideinWMS,bbockelm/glideinWMS