Let Synda continue after an error trying to renew a certificate #145
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Presently, if Synda encounters an error trying to renew a certificate, it quits.
With this change, the user can set a 'download' option 'continue_on_cert_errors'
to 'true' in sdt.conf. Then Synda will just keep on going. It defaults to
'false', so you the old behavior if you do not change your config file.
However, for CMIP-6 most data nodes do not require authentication, to it is best
to set continue_on_cert_errors to true and keep on getting the data.
I made these changes because last month the LLNL identity/myproxy server was down for 3-4 days. That brought down Synda even though the certs were probably ok and most data nodes didn't require them at all. This won't happen again.