hg: jdk/sandbox: 8200363: Add javadoc command line setting to fail on warnings

[chris.hegarty at oracle.com]

Changeset: 8d8bd676484d
Author:    jjg
Date:      2020-01-30 11:29 -0800
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/8d8bd676484d

8200363: Add javadoc command line setting to fail on warnings
Reviewed-by: hannesw

! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/Start.java
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/ToolOptions.java
! src/jdk.javadoc/share/classes/jdk/javadoc/internal/tool/resources/javadoc.properties
+ test/langtools/jdk/javadoc/tool/testWErrorOption/TestWErrorOption.java