Add github.com/cobaugh/osrelease as dependency

This is needed for parsing /etc/os-release file.

This done via:
GO111MODULE=on go get github.com/cobaugh/osrelease
GO111MODULE=on go mod vendor

Author: Xuewei Zhang

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2 // indirect
 	github.com/StackExchange/wmi v0.0.0-20181212234831-e0a55b97c705 // indirect
 	github.com/beorn7/perks v1.0.0 // indirect
+	github.com/cobaugh/osrelease v0.0.0-20181218015638-a93a0a55a249
 	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
 	github.com/coreos/pkg v0.0.0-20160620232715-fa29b1d70f0b // indirect
 	github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633 // indirect

go.sum

@@ -16,6 +16,8 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cobaugh/osrelease v0.0.0-20181218015638-a93a0a55a249 h1:R0IDH8daQ3lODvu8YtxnIqqth5qMGCJyADoUQvmLx4o=
+github.com/cobaugh/osrelease v0.0.0-20181218015638-a93a0a55a249/go.mod h1:EHKW9yNEYSBpTKzuu7Y9oOrft/UlzH57rMIB03oev6M=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e h1:Wf6HqHfScWJN9/ZjdUKyjop4mf3Qdd+1TvvltAvM3m8=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160620232715-fa29b1d70f0b h1:IqgHacj6F3QnV+0H9PXFWAmML5HdxkZakBQgZgfD+FU=

vendor/github.com/cobaugh/osrelease/.travis.yml

@@ -11,6 +11,8 @@ github.com/PuerkitoBio/urlesc
 github.com/StackExchange/wmi
 # github.com/beorn7/perks v1.0.0
 github.com/beorn7/perks/quantile
+# github.com/cobaugh/osrelease v0.0.0-20181218015638-a93a0a55a249
+github.com/cobaugh/osrelease
 # github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
 github.com/coreos/go-systemd/sdjournal
 # github.com/coreos/pkg v0.0.0-20160620232715-fa29b1d70f0b