Remove unused dependencies

Gopkg.lock

@@ -116,17 +116,6 @@
   revision = "1dc8cf203d24cd454e71ce40ab4cd0bf3112df90"
   version = "v1.27.0"
 
-[[projects]]
-  branch = "master"
-  digest = "1:a74730e052a45a3fab1d310fdef2ec17ae3d6af16228421e238320846f2aaec8"
-  name = "github.com/alecthomas/template"
-  packages = [
-    ".",
-    "parse",
-  ]
-  pruneopts = ""
-  revision = "a0175ee3bccc567396460bf5acd36800cb10c49c"
-
 [[projects]]
   branch = "master"
   digest = "1:8483994d21404c8a1d489f6be756e25bfccd3b45d65821f25695577791a08e68"
@@ -952,7 +941,6 @@
   packages = [
     "expfmt",
     "internal/bitbucket.org/ww/goautoneg",
-    "log",
     "model",
   ]
   pruneopts = ""
@@ -1413,14 +1401,6 @@
   revision = "168a6198bcb0ef175f7dacec0b8691fc141dc9b8"
   version = "v1.13.0"
 
-[[projects]]
-  digest = "1:15d017551627c8bb091bde628215b2861bed128855343fdd570c62d08871f6e1"
-  name = "gopkg.in/alecthomas/kingpin.v2"
-  packages = ["."]
-  pruneopts = ""
-  revision = "947dcec5ba9c011838740e680966fd7087a71d0d"
-  version = "v2.2.6"
-
 [[projects]]
   digest = "1:3cad99e0d1f94b8c162787c12e59d0a0b9df1ef75590eb145cdd625479091efe"
   name = "gopkg.in/asn1-ber.v1"
@@ -1597,11 +1577,11 @@
     "github.com/nsqio/go-nsq",
     "github.com/openzipkin/zipkin-go-opentracing",
     "github.com/openzipkin/zipkin-go-opentracing/thrift/gen-go/zipkincore",
+    "github.com/pkg/errors",
     "github.com/prometheus/client_golang/prometheus",
     "github.com/prometheus/client_golang/prometheus/promhttp",
     "github.com/prometheus/client_model/go",
     "github.com/prometheus/common/expfmt",
-    "github.com/prometheus/common/log",
     "github.com/satori/go.uuid",
     "github.com/shirou/gopsutil/cpu",
     "github.com/shirou/gopsutil/disk",