Handle mandatory attributes for DSA, DH, and ECDSA correctly

Incoming mandatory attributes for DSA (CKA_PRIME, CKA_SUBPRIME, CKA_BASE) and ECDSA (CKA_EC_PARAMS) are ignored when saving the template. It will thus look like they are missing when performing the checks in P11Object::saveTemplate().

In generateDSA and generateEC, remove the attributes from the publicKeyAttribs-switch-statement and also remove them from the manual encryption when saving the public object.

These attributes will be automatically encrypted when calling CreateObject().