Fix mismatched code coverage errors

'codecgen' embeds a random integer in each identifier; this means code
coverage across different CircleCI lanes may not match.
Here we force the integer to 23 on every CircleCI build so they always match.

Makefile

@@ -18,6 +18,7 @@ DOCKER_DISTRIB_URL=https://get.docker.com/builds/Linux/x86_64/docker-$(DOCKER_VE
 RUNSVINIT=vendor/runsvinit/runsvinit
 CODECGEN_DIR=vendor/github.com/ugorji/go/codec/codecgen
 CODECGEN_EXE=$(CODECGEN_DIR)/bin/codecgen_$(shell go env GOHOSTOS)_$(shell go env GOHOSTARCH)
+CODECGEN_UID=0
 GET_CODECGEN_DEPS=$(shell find $(1) -maxdepth 1 -type f -name '*.go' -not -name '*_test.go' -not -name '*.codecgen.go' -not -name '*.generated.go')
 CODECGEN_TARGETS=report/report.codecgen.go render/detailed/detailed.codecgen.go
 RM=--rm
@@ -110,7 +111,7 @@ $(SCOPE_EXE): $(SCOPE_BACKEND_BUILD_UPTODATE)
 
 %.codecgen.go: $(CODECGEN_EXE)
 	rm -f $@; $(GO_HOST) build $(GO_BUILD_FLAGS) ./$(@D) # workaround for https://github.com/ugorji/go/issues/145
-	cd $(@D) && $(WITH_GO_HOST_ENV) $(shell pwd)/$(CODECGEN_EXE) -rt $(GO_BUILD_TAGS) -u -o $(@F) $(notdir $(call GET_CODECGEN_DEPS,$(@D)))
+	cd $(@D) && $(WITH_GO_HOST_ENV) $(shell pwd)/$(CODECGEN_EXE) -d $(CODECGEN_UID) -rt $(GO_BUILD_TAGS) -u -o $(@F) $(notdir $(call GET_CODECGEN_DEPS,$(@D)))
 
 $(CODECGEN_EXE): $(CODECGEN_DIR)/*.go
 	mkdir -p $(@D)

circle.yml

@@ -42,7 +42,7 @@ test:
   override:
     - cd $SRCDIR; make RM= lint:
         parallel: true
-    - cd $SRCDIR; COVERDIR=./coverage make RM= tests:
+    - cd $SRCDIR; COVERDIR=./coverage make RM= CODECGEN_UID=23 tests:
         parallel: true
     - cd $SRCDIR; make RM= client-test static:
         parallel: true