bump go to 1.16, other misc fixes

- add selinux relabling to release.sh
- use same go version in root

Signed-off-by: Casey Callendrello <cdc@redhat.com>

.github/workflows/test.yaml

@@ -4,7 +4,7 @@ name: test
 on: ["push", "pull_request"]
 
 env:
-  GO_VERSION: "1.15"
+  GO_VERSION: "1.16"
   LINUX_ARCHES: "amd64 386 arm arm64 s390x mips64le ppc64le"
 
 jobs:
@@ -39,6 +39,10 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: ${{ env.GO_VERSION }}
+      - name: Set up Go for root
+        run: |
+          sudo ln -sf `which go` `sudo which go` || true
+          sudo go version
       - uses: actions/checkout@v2
 
       - name: Install test binaries