RFR 8198645 Use System.lineSeparator() instead of getProperty("line.separator")

[Roger Riggs]

Please review cleanup replacements of 
System.getProperty("line.separator") with System.lineSeparator().
It uses the line separator from System instead of looking it up in the 
properties each time.
Also fixed one javadoc @see reference.

The affected files are in several packages:

    com/sun/crypto/provider/
    java/util/regex/
    jdk/internal/util/xml/impl/

Webrev:
   http://cr.openjdk.java.net/~rriggs/webrev-line-separator-8198645/

Thanks, Roger