RFR [12]: 8191136: Remove deprecated java.security.{Certificate,Identity,IdentityScope,Signer} APIs

[Sean Mullan]

Please remove this change to remove the Certificate, Identity, 
IdentityScope, and Signer APIs. These APIs were marked for removal in 
Java SE 10. They have been deprecated since Java SE 1.2, and have long 
been superseded by other security APIs. Several SecurityPermission 
targets and one security property that are only applicable to these APIs 
have also been removed.

webrev: http://cr.openjdk.java.net/~mullan/webrevs/8191136/webrev.00/
CSR: https://bugs.openjdk.java.net/browse/JDK-8212916

--Sean