RFR: JDK-8242532 convert tests to use Text Blocks

[Jonathan Gibbons]

Please review a big, but conceptually simple, change to convert JavaDoc 
tests to use text blocks where reasonable.

This is an "automated" change, albeit using a custom new utility program 
written for this specific purpose.  There are no manual edits to any 
test files. There should be no functional change in any test file.

The conversion program scans source files looking for candidates to 
convert into text blocks. Candidates are long strings containing '\n' or 
'"' characters.

Some tests contain very long strings, that previously were manually 
wrapped at arbitrary points in the string. The converter program wraps 
these very long strings (> 240 characters) every 80 characters. The 
fixed length of each "chunk" and trailing '\' helps provide a visual 
distinctive block of text for the long line. Note, this algorithm 
assumes there is no risk of breaking low-level Unicode sequences within 
the strings in the test files.

-- Jon

JBS: https://bugs.openjdk.java.net/browse/JDK-8242532
Webrev: http://cr.openjdk.java.net/~jjg/8242532/webrev.01/