Use proportional memory size when available for process monitoring

This use WIP as it depend on forks of process-exporter & procfs.
See ncabatoff/process-exporter#140

go.mod

@@ -8,9 +8,6 @@ require (
 	github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
 	github.com/Microsoft/go-winio v0.4.14 // indirect
 	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
-	github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4 // indirect
-	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cockroachdb/apd v1.1.0 // indirect
 	github.com/containerd/containerd v1.3.3 // indirect
 	github.com/docker/distribution v2.7.1+incompatible // indirect
@@ -19,33 +16,31 @@ require (
 	github.com/docker/go-units v0.4.0 // indirect
 	github.com/eclipse/paho.mqtt.golang v1.2.0
 	github.com/go-chi/chi v4.0.4+incompatible
+	github.com/go-kit/kit v0.10.0
 	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/go-redis/redis v6.15.7+incompatible // indirect
 	github.com/go-sql-driver/mysql v1.5.0 // indirect
 	github.com/gobuffalo/packr/v2 v2.7.1
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/gofrs/uuid v3.2.0+incompatible // indirect
-	github.com/google/go-cmp v0.4.0 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/imdario/mergo v0.3.9 // indirect
 	github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d
 	github.com/influxdata/telegraf v0.10.2-0.20200225205246-ffabd6b5cffa
 	github.com/jackc/fake v0.0.0-20150926172116-812a484cc733 // indirect
 	github.com/jackc/pgx v3.6.2+incompatible // indirect
-	github.com/json-iterator/go v1.1.9 // indirect
 	github.com/lib/pq v1.3.0 // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/ncabatoff/process-exporter v0.6.0
 	github.com/opencontainers/go-digest v1.0.0-rc1 // indirect
 	github.com/opencontainers/image-spec v1.0.1 // indirect
-	github.com/prometheus/client_golang v0.9.3
+	github.com/prometheus/client_golang v1.4.1
 	github.com/prometheus/client_model v0.2.0
-	github.com/prometheus/common v0.4.1
-	github.com/prometheus/node_exporter v0.18.1
+	github.com/prometheus/common v0.9.1
+	github.com/prometheus/node_exporter v1.0.0-rc.0
 	github.com/rs/cors v1.7.0
 	github.com/shirou/gopsutil v2.20.2+incompatible
 	github.com/shopspring/decimal v0.0.0-20200227202807-02e2044944cc // indirect
-	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/tidwall/gjson v1.6.0 // indirect
 	github.com/vektah/gqlparser v1.3.1
 	github.com/vektah/gqlparser/v2 v2.0.1
@@ -60,3 +55,7 @@ require (
 	k8s.io/apimachinery v0.18.0
 	k8s.io/client-go v0.18.0
 )
+
+replace github.com/ncabatoff/process-exporter => github.com/PierreF/process-exporter v0.6.1-0.20200408081929-b5a3a32568ae
+
+replace github.com/prometheus/procfs => github.com/PierreF/procfs v0.0.12-0.20200408075604-52118802aeee