RFR(XS): CODETOOLS-7902075: jtreg doesn't build if jh.jar doesn't contain signatures

[Volker Simonis]

Hi,

can I please have a sponsor for the following simple fix of the jtreg build:

http://cr.openjdk.java.net/~simonis/webrevs/2017/CODETOOLS-7902075/
https://bugs.openjdk.java.net/browse/CODETOOLS-7902075

Change "7901920: jh.jar is signed with a weak algorithm and its
certificate is expired" introduced a logic to remove outdated
signatures from jh.jar.

However, there's no default location for downloading jh.jar and
probably most available versions (e.g. the one from Maven:
http://central.maven.org/maven2/javax/help/javahelp/2.0.05/javahelp-2.0.05.jar)
if not all of them don't contain signatures at all. This breaks the
build because removing the signatures from the jar file with zip will
fail with the following error:

zip warning: name not matched: META-INF/*.SF
zip warning: name not matched: META-INF/*.RSA
zip warning: name not matched: META-INF/*.DSA
zip error: Nothing to do!
(/net/usr.work/openjdk/tools/jtreg/jtreg/build/images/jtreg/lib/jh.jar

It would be great if the sponsor could also tag this fix with
jtreg4.2-b11 after pushing it because the last tagged version (i.e.
jtreg4.2-b10) doesn't build out of the box without JCov (which should
be optional and which was fixed by "7902072: Add support for imported
license files").

Thank you and best regards,
Volker