add gocyclo back to integration CI (#267)

It's used by the makefile and was inadvertently removed.

eng/integration-tests.yml

@@ -29,6 +29,7 @@ steps:
       go install github.com/axw/gocov/gocov@v1.1.0
       go install github.com/AlekSi/gocov-xml@v1.0.0
       go install github.com/matm/gocov-html@v0.0.0-20200509184451-71874e2e203b
+      go install github.com/fzipp/gocyclo/cmd/gocyclo@v0.6.0
     displayName: 'Install Dependencies'
   - script: |
       set -e