RFR: JDK-8054999 - create support for custom security policy

[Stas Smirnov]

issue: JDK-8054999 <https://bugs.openjdk.java.net/browse/JDK-8054999>
webrev: http://cr.openjdk.java.net/~stsmirno/8054999/webrev/

Hi All,

Need a review for an update.
These changes  add two custom classes to be able to set Policy 
programmatically without any need to specify java.security.policy file 
in the command line.
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Best regards,
Stas Smirnov

Stas Smirnov | Java Embedded
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