mattermost update to 5.17.0

Signed-off-by: webbuilder_pel7ppc64lebuilder0 <webbuilder@powerel.org>

SPECS/mattermost.spec

@@ -5,7 +5,7 @@
 %define debug_package %{nil}
 
 Name         : mattermost
-Version      : 5.15.1
+Version      : 5.17.0
 Release      : 1%{dist}
 License      : MIT
 URL          : https://mattermost.io
@@ -36,8 +36,10 @@ git clone https://github.com/mattermost/mattermost-webapp/
 
 %build
 export GOPATH=`pwd`
+export GO111MODULE=on
 cd src/github.com/mattermost/mattermost-server/
 git checkout tags/v%{version}
+git submodule update --init --recursive
 go get -d ./...
 %ifarch ppc64 ppc64le
 sed 's/amd64/%{_arch}/g' -i build/release.mk