Update urfave/cli to v1.21.0

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/opencontainers/selinux v1.2.2
 	github.com/pborman/uuid v1.2.0
 	github.com/sirupsen/logrus v1.4.2
-	github.com/urfave/cli v0.0.0-20180821064027-934abfb2f102
+	github.com/urfave/cli v1.21.0
 	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80
 	golang.org/x/sys v0.0.0-20190730183949-1393eb018365
 	google.golang.org/grpc v1.23.0

go.sum

@@ -427,8 +427,8 @@ github.com/syndtr/gocapability v0.0.0-20160928074757-e7cb7fa329f4/go.mod h1:hkRG
 github.com/timakin/bodyclose v0.0.0-20190407043127-4a873e97b2bb h1:lI9ufgFfvuqRctP9Ny8lDDLbSWCMxBPletcSqrnyFYM=
 github.com/timakin/bodyclose v0.0.0-20190407043127-4a873e97b2bb/go.mod h1:Qimiffbc6q9tBWlVV6x0P9sat/ao1xEkREYPPj9hphk=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20170815181823-89b8d40f7ca8/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
-github.com/urfave/cli v0.0.0-20180821064027-934abfb2f102 h1:Er7kUEUX12vAWCp23Uv6Nrza7kEzEm/Z77amjMT7/Lo=
-github.com/urfave/cli v0.0.0-20180821064027-934abfb2f102/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
+github.com/urfave/cli v1.21.0 h1:wYSSj06510qPIzGSua9ZqsncMmWE3Zr55KBERygyrxE=
+github.com/urfave/cli v1.21.0/go.mod h1:lxDj6qX9Q6lWQxIrbrT0nwecwUtRnhVZAJjJZrVUZZQ=
 github.com/urfave/negroni v1.0.0/go.mod h1:Meg73S6kFm/4PpbYdq35yYWoCZ9mS/YSx+lKnmiohz4=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasthttp v1.2.0/go.mod h1:4vX61m6KN+xDduDNwXrhIAVZaZaZiQ1luJk8LWSxF3s=