RFR 8214024: Remove the default keytool -keyalg value

[Weijun Wang]

Bug: https://bugs.openjdk.java.net/browse/JDK-8214024
CSR: https://bugs.openjdk.java.net/browse/JDK-8233427
Webrev: http://cr.openjdk.java.net/~weijun/8214024/webrev.00/

For most test changes, I simply added a "-keyalg DSA" to preserve the old behavior.

DeprecateKeyAlg.java is renamed to RemoveKeyAlgDefault.java and detection of warnings is changed to that of errors. 3 lines in this test are moved to another test.

Thanks,
Max