RFR : 8068795: Missing trailing blank in a HttpServer response leads to client crashes

[Lev Priima]

The second space should not be omitted in first line(status-line) of a 
http response message: http://tools.ietf.org/html/rfc7230#section-3.1.2 .

Issue: http://bugs.openjdk.java.net/browse/JDK-8068795
Patch: http://cr.openjdk.java.net/~lpriima/8068795/webrev.00/
Testing:
$ jtreg -jdk:jdk9/dev/build/linux-x86_64-normal-server-release/jdk/ 
jdk9/dev/jdk/test/com/sun/net/httpserver/
Test results: passed: 41
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Best Regards,
Lev