RFR(S): 8067211: rewrite Utils::fileAsString

[Tatiana Pivovarova]

Hi all,

please review this small patch

bugid: https://bugs.openjdk.java.net/browse/JDK-8067211
webrev: http://cr.openjdk.java.net/~ppunegov/tpivovarova/8067211/webrev.00/

Problem:
Utils::fileAsString implementation has several issues:
  - using '\n' instead of platform independent EOL
  - catching wide spectre of exceptions and "ignoring" them
  - partially duplicates code of Utils::fileAsList method which 
duplicates File::readAllLines

Solution:
  - using library method for reading lines
  - using system property for EndOfLine.

Testing: jprt

Thanks,
Tatiana