*: update errcheck and remove vendor in release 2.1 (#9114)

Makefile

@@ -92,8 +92,7 @@ check-slow:tools/bin/gometalinter tools/bin/gosec
 
 errcheck:tools/bin/errcheck
 	@echo "errcheck"
-	@$(GO) mod vendor
-	@tools/bin/errcheck -exclude ./tools/check/errcheck_excludes.txt -blank $(PACKAGES) | grep -v "_test\.go" | awk '{print} END{if(NR>0) {exit 1}}'
+	@GO111MODULE=on tools/bin/errcheck -exclude ./tools/check/errcheck_excludes.txt -blank $(PACKAGES) | grep -v "_test\.go" | awk '{print} END{if(NR>0) {exit 1}}'
 
 lint:tools/bin/revive
 	@echo "linting"

tools/check/go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/dnephin/govet v0.0.0-20171012192244-4a96d43e39d3
 	github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf // indirect
 	github.com/gordonklaus/ineffassign v0.0.0-20180909121442-1003c8bd00dc
-	github.com/kisielk/errcheck v1.1.0
+	github.com/kisielk/errcheck v1.2.0
 	github.com/mgechev/revive v0.0.0-20181210140514-b4cc152955fb
 	github.com/nicksnyder/go-i18n v1.10.0 // indirect
 	github.com/pelletier/go-toml v1.2.0 // indirect

tools/check/go.sum

@@ -20,8 +20,8 @@ github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf h1:7+FW5aGwISbqUtkfmI
 github.com/google/shlex v0.0.0-20181106134648-c34317bd91bf/go.mod h1:RpwtwJQFrIEPstU94h88MWPXP2ektJZ8cZ0YntAmXiE=
 github.com/gordonklaus/ineffassign v0.0.0-20180909121442-1003c8bd00dc h1:cJlkeAx1QYgO5N80aF5xRGstVsRQwgLR7uA2FnP1ZjY=
 github.com/gordonklaus/ineffassign v0.0.0-20180909121442-1003c8bd00dc/go.mod h1:cuNKsD1zp2v6XfE/orVX2QE1LC+i254ceGcVeDT3pTU=
-github.com/kisielk/errcheck v1.1.0 h1:ZqfnKyx9KGpRcW04j5nnPDgRgoXUeLh2YFBeFzphcA0=
-github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
+github.com/kisielk/errcheck v1.2.0 h1:reN85Pxc5larApoH1keMBiu2GWtPqXQ1nc9gx+jOU+E=
+github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
 github.com/kisielk/gotool v0.0.0-20161130080628-0de1eaf82fa3/go.mod h1:jxZFDH7ILpTPQTk+E2s+z4CUas9lVNjIuKR4c5/zKgM=
 github.com/kisielk/gotool v1.0.0 h1:AV2c/EiW3KqPNT9ZKl07ehoAGi4C5/01Cfbblndcapg=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
@@ -65,6 +65,8 @@ golang.org/x/tools v0.0.0-20170915040203-e531a2a1c15f/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180911133044-677d2ff680c1 h1:dzEuQYa6+a3gROnSlgly5ERUm4SZKJt+dh+4iSbO+bI=
 golang.org/x/tools v0.0.0-20180911133044-677d2ff680c1/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563 h1:NIou6eNFigscvKJmsbyez16S2cIS6idossORlFtSt2E=
+golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 gopkg.in/alecthomas/gometalinter.v2 v2.0.4 h1:MefA8hNMNyIgHyPFo835JDk6TvJVHdRtDu0RpZ+j5N4=
 gopkg.in/alecthomas/gometalinter.v2 v2.0.4/go.mod h1:NDRytsqEZyolNuAgTzJkZMkSQM7FIKyzVzGhjB/qfYo=
 gopkg.in/alecthomas/gometalinter.v2 v2.0.5 h1:GFmgH6hxUKdHDigDNUB8KttpU7DNk6quSxzrp7qjeR0=