Use new location for gocheck that works with git and not bzr

The golang Docker containers do not include bzr which caused the
build to fail for the gocheck library.
Switch to the GitHub repository which is the new upstream location.

go.mod

@@ -25,6 +25,7 @@ require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/digitalocean/godo v1.1.3
 	github.com/dimchansky/utfbom v1.1.0 // indirect
+	github.com/go-check/check v0.0.0-20140225173054-eb6ee6f84d0a // indirect
 	github.com/godbus/dbus v0.0.0-20181025153459-66d97aec3384
 	github.com/gogo/protobuf v1.2.1 // indirect
 	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
@@ -75,7 +76,6 @@ require (
 	google.golang.org/appengine v1.6.0 // indirect
 	google.golang.org/genproto v0.0.0-20190611190212-a7e196e89fd3 // indirect
 	google.golang.org/grpc v1.19.1 // indirect
-	launchpad.net/gocheck v0.0.0-20140225173054-000000000087 // indirect
 )
 
 replace google.golang.org/cloud => cloud.google.com/go v0.0.0-20190220171618-cbb15e60dc6d

go.sum

@@ -62,6 +62,7 @@ github.com/dimchansky/utfbom v1.1.0 h1:FcM3g+nofKgUteL8dm/UpdRXNC9KmADgTpLKsu0TR
 github.com/dimchansky/utfbom v1.1.0/go.mod h1:rO41eb7gLfo8SF1jd9F8HplJm1Fewwi4mQvIirEdv+8=
 github.com/ghodss/yaml v1.0.0 h1:wQHKEahhL6wmXdzwWG11gIVCkOv05bNOh+Rxn0yngAk=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-check/check v0.0.0-20140225173054-eb6ee6f84d0a/go.mod h1:9ES+weclKsC9YodN5RgxqK/VD9HM9JsCSh7rNhMZE98=
 github.com/godbus/dbus v0.0.0-20181025153459-66d97aec3384 h1:xNwo3yd3PZYRDAr/Dz0sBfDWY6El2xPCKJrwJVfMFjY=
 github.com/godbus/dbus v0.0.0-20181025153459-66d97aec3384/go.mod h1:/YcGZj5zSblfDWMMoOzV4fas9FZnQYTkDnsGvmh2Grw=
 github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE=
@@ -259,5 +260,3 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20190502103701-55513cacd4ae/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-launchpad.net/gocheck v0.0.0-20140225173054-000000000087 h1:Izowp2XBH6Ya6rv+hqbceQyw/gSGoXfH/UPoTGduL54=
-launchpad.net/gocheck v0.0.0-20140225173054-000000000087/go.mod h1:hj7XX3B/0A+80Vse0e+BUHsHMTEhd0O4cpUHr/e/BUM=