test: add parsing test case for hvsock

Unfortunately this currently fails because url.Parse is more strict
than it used to be:
```
2022/05/22 15:39:42 Failed to parse
hvsock://00000000-0000-0000-0000-000000000000:00001010-FACB-11E6-BD58-64006A7986D3:
parse
"hvsock://00000000-0000-0000-0000-000000000000:00001010-FACB-11E6-BD58-64006A7986D3":
invalid port ":00001010-FACB-11E6-BD58-64006A7986D3" after host
exit status 1
FAIL    github.com/linuxkit/virtsock/cmd/sock_stress    0.236s
```

Signed-off-by: David Scott <dave@recoil.org>

Author: djs55

cmd/sock_stress/main_test.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParseHVSock(t *testing.T) {
+	scheme, sock := parseSockStr("hvsock://00000000-0000-0000-0000-000000000000/00001010-FACB-11E6-BD58-64006A7986D3")
+	assert.Equal(t, "hvsock", scheme)
+	assert.Equal(t, "00000000-0000-0000-0000-000000000000:00001010-facb-11e6-bd58-64006a7986d3", sock.String())
+}

go.mod

@@ -4,5 +4,12 @@ go 1.17
 
 require (
 	github.com/pkg/errors v0.8.1-0.20170910134614-2b3a18b5f0fb
+	github.com/stretchr/testify v1.7.1
 	golang.org/x/sys v0.0.0-20170511214829-9c9d83fe39ed
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)

go.sum

@@ -1,4 +1,14 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pkg/errors v0.8.1-0.20170910134614-2b3a18b5f0fb h1:CKWls8QOVQs/qmuUuGOeHMpIqSx6f9S72udJ48vEeKo=
 github.com/pkg/errors v0.8.1-0.20170910134614-2b3a18b5f0fb/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 golang.org/x/sys v0.0.0-20170511214829-9c9d83fe39ed h1:zZ09nMxaZ+d+ObsmknNM+RrXWBw+22dzC/Fm62ueXgs=
 golang.org/x/sys v0.0.0-20170511214829-9c9d83fe39ed/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=