RFR 8201290: keytool importcert fails with CertificateParsingException if unknown certificate algorithms should be imported

[Weijun Wang]

Please take a review at

  http://cr.openjdk.java.net/~weijun/8201290/webrev.00/

Please note I didn't use srcProviderName as suggested in the bug report. It was 
designed to be used by the "keytool -importkeystore" command only.

Thanks
Max