vendor: un-pin github.com/coreos/pkg

It's not used as a direct dependency, and not vendored.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.mod

@@ -170,7 +170,6 @@ replace (
 	github.com/armon/go-metrics => github.com/armon/go-metrics v0.0.0-20150106224455-eb0af217e5e9
 	github.com/armon/go-radix => github.com/armon/go-radix v0.0.0-20150105235045-e39d623f12e8
 	github.com/coreos/go-systemd => github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7
-	github.com/coreos/pkg => github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea
 	github.com/hashicorp/go-msgpack => github.com/hashicorp/go-msgpack v0.0.0-20140221154404-71c2886f5a67
 	github.com/hashicorp/go-multierror => github.com/hashicorp/go-multierror v1.0.0
 	github.com/hashicorp/serf => github.com/hashicorp/serf v0.7.1-0.20160317193612-598c54895cc5

vendor.sum

@@ -320,7 +320,8 @@ github.com/coreos/go-systemd/v22 v22.0.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+
 github.com/coreos/go-systemd/v22 v22.1.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk=
 github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzAJc1DzSI=
 github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
-github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=

vendor/modules.txt

@@ -1119,7 +1119,6 @@ gotest.tools/v3/skip
 # github.com/armon/go-metrics => github.com/armon/go-metrics v0.0.0-20150106224455-eb0af217e5e9
 # github.com/armon/go-radix => github.com/armon/go-radix v0.0.0-20150105235045-e39d623f12e8
 # github.com/coreos/go-systemd => github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7
-# github.com/coreos/pkg => github.com/coreos/pkg v0.0.0-20180108230652-97fdf19511ea
 # github.com/hashicorp/go-msgpack => github.com/hashicorp/go-msgpack v0.0.0-20140221154404-71c2886f5a67
 # github.com/hashicorp/go-multierror => github.com/hashicorp/go-multierror v1.0.0
 # github.com/hashicorp/serf => github.com/hashicorp/serf v0.7.1-0.20160317193612-598c54895cc5