Refactor prometheus integration

Move prometheus to SaaS and make it a plugin
Move static callers to use metrics_queue plugin
Change local-docker to support different quay clone dirnames
Change prom_aggregator to use logrus

local-docker.sh

@@ -6,7 +6,7 @@ REPO=quay.io/quay/quay-dev
 
 d ()
 {
-	docker build -t $REPO -f dev.df .
+	docker build -t $REPO -f dev.df --build-arg src_subdir=$(basename `pwd`) .
 	docker -- run --rm -v /var/run/docker.sock:/run/docker.sock -it --net=host -v $(pwd)/..:/src $REPO $*
 }
 
@@ -33,7 +33,7 @@ fulldbtest)
 prom)
 	R=quay.io/quay/prom-monitor
 	docker build -t $R prom_aggregator
-	docker run --rm -it --net=host $R
+	docker run --rm -it --net=host $R -loglevel=debug
 	;;
 *)
 	echo "unknown option"