Optional to use crl.pem file

[Bjarke42]

In my certificate catalogue on the migrid server I need to add a crl.pem fil even though its not required for the usage I have.

Could you make it optional to have a crl file so that if its not needed in the installation its not needed to be added for migrid to run.

An example could be that the service can start without requiring the certificated, when not needed, and if its required you need to add it, or the server will fail during run time.

[jonasbardino]

should be fixed with svn rev 5672 and corresponding git revs. The cacert and crl files are commented out unless a cert vhost is defined.