refactor(golang): add dep for zeromq/goczmq@4715d4da6d4b

Pull <github.com/zeromq/goczmq@4715d4da6d4b> as a dep rather than
<gopkg.in/zeromq/goczmq.v4> for the reasons described here:
  - <zeromq/goczmq#279> (see option 5)

Use zeromq/goczmq@4715d4da6d4 as a workaround until the upstream fixes
the issue.

golang/go.mod

@@ -6,5 +6,7 @@ require (
 	github.com/ghodss/yaml v1.0.0 // indirect
 	github.com/golang/protobuf v1.4.3 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
+	// gopkg.in/zeromq/goczmq.v4 v4.2.0 see README.md for Notes
+	github.com/zeromq/goczmq v0.0.0-20190622112907-4715d4da6d4b // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

golang/go.sum

@@ -12,6 +12,8 @@ github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/zeromq/goczmq v0.0.0-20190622112907-4715d4da6d4b h1:YpaMy+JU2SxemXSlojLIwDdsc/k598f7DocPQxdWKIY=
+github.com/zeromq/goczmq v0.0.0-20190622112907-4715d4da6d4b/go.mod h1:jBJgSEDlcqrdShbpgYc2S+mTo1Rs6pac+8zpUQFgsvg=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=