There are some intermittent test failures in java/net/httpclient. Since development
is ongoing over in the sandbox [1], then it is probably best to exclude these tests
from the jdk_net test group, in the JDK 9 mainline, temporarily.

diff -r a80fd00b0cd0 test/TEST.groups
--- a/test/TEST.groups Tue Oct 25 10:31:49 2016 +0100
+++ b/test/TEST.groups Tue Oct 25 13:51:32 2016 +0100
@@ -158,6 +158,7 @@

jdk_net = \
    java/net \
+ -java/net/httpclient \
    com/sun/net/httpserver \
    sun/net \
    jdk/net

[1] http://hg.openjdk.java.net/jdk9/sandbox/jdk/branches [http-client-branch]