hg: jdk/sandbox: http-client-branch: fix header field-value validation

[daniel.fuchs at oracle.com]

Changeset: 7b2e4c363335
Author:    dfuchs
Date:      2018-03-29 09:55 +0100
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/7b2e4c363335

http-client-branch: fix header field-value validation

! src/java.net.http/share/classes/jdk/internal/net/http/common/Utils.java
! test/jdk/java/net/httpclient/HeadersTest.java
! test/jdk/java/net/httpclient/HeadersTest1.java