Bug 919 - Initialize revocation certificate cache during start up - speed up...

Bug 919 - Initialize revocation certificate cache during start up - speed up first document processing

3.1 For this - add new method getRevocationSourceType to IRevocationLookup. Add enum RevocationSourceType to IRevocationLookup with values CRL, OCSP. Default is CRL. This will allow us in future to extend it with something more if we have not only OCSP or CRL source for revocation (e.g. DB?).
3.2 Modify OCSPLookup and CRLLookup to implement this method by returning CRL or OCSP.

git-svn-id: file:///svnrepo/openebusiness/dk.gov.oiosi/library/java/trunk@19610 4e58de57-8926-0410-947e-8945c843cdd7