RFR 8027026: Change keytool -genkeypair to use -keyalg RSA

[Weijun Wang]

There is a bug on Solaris on DSA keypair generation, and DSA related 
test has a 1/256 probability to fail at signature verification. This fix 
updates all non algorithm related "keytool -genkeypair" calls to using RSA.

Please take a review:
   http://cr.openjdk.java.net/~weijun/8027026/webrev.00

Thanks
Max