Update tomcat link to fix broken builds

Changing link from 8.5.30 to 8.5.31, since 8.5.30 is no longer available.

Issue-ID: VNFSDK-265

Change-Id: I1931c7e194567becbb33aa7ff34c89d5271ab659
Signed-off-by: Chris Donley <christopher.donley@huawei.com>
1 file changed