RFR [13] JDK-8226374 Restric signature algorithms and named groups

[Xuelei Fan]

Hi,

Could I get the following update reviewed?
     http://cr.openjdk.java.net/~xuelei/8226374/webrev.00/

During handshaking, the selection of signature algorithms was not 
checked with the algorithm constraints.  Then the available signature 
algorithms may be ignored if a restricted algorithm get selected.  The 
connection should be able to be established as there are available 
algorithms.

Within this update, more algorithm constraints checking are introduced 
in the signature algorithms and named groups code.

The significant changes are in NamedGroup.java and SignatureScheme.java, 
in order to introduce the checking and algorithm parameters and specs.

Thanks,
Xuelei