RFR 8049834: Two security tools tests do not run with only JRE

[Wang Weijun]

Hi All

Please review the code change at

  http://cr.openjdk.java.net/~weijun/8049834/webrev.00/

These 2 tests do not run with only JRE because they are testing on jarsigner. The weaksize.sh is simply moved to jarsigner, and default_options.sh broken into 2 parts with the jarsigner part going to jarsigner.

After this change, I can safely run

   jtreg -compilejdk:../build/macosx-x86_64-normal-server-fastdebug/images/j2sdk-image/ -jdk:../build/macosx-x86_64-normal-server-fastdebug/images/j2re-image/ test/sun/security/tools/keytool/default_options.sh 

Thanks
Max