Use clean to cleanup the host file for windows

Clean() functionality in the goodhost library try to
do cleanup the hosts file which remove duplicate entry
and also make sure for windows each line have max 9 hosts per
IP address.

```
> .\crc-admin-helper.exe add 192.168.0.1 foo.apps-crc.testing b.apps-crc.testing c.apps-crc.testing d.apps-crc.testing e.apps-crc.testing f.apps-crc.testing g.apps-crc.testing h.apps-crc.testing
i.apps-crc.testing j.apps-crc.testing

> cat 'C:\Windows\System32\drivers\etc\hosts'
192.168.0.1 b.apps-crc.testing c.apps-crc.testing d.apps-crc.testing e.apps-crc.testing f.apps-crc.testing foo.apps-crc.testing g.apps-crc.testing h.apps-crc.testing i.apps-crc.testing
192.168.0.1 j.apps-crc.testing test.apps-crc.testing

```

Author: praveenkumar

pkg/hosts/hosts.go

@@ -3,6 +3,7 @@ package hosts
 import (
 	"fmt"
 	"regexp"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -66,6 +67,11 @@ func (h *Hosts) Add(ip string, hosts []string) error {
 	if err := h.File.Add(ip, hostEntries...); err != nil {
 		return err
 	}
+	// Only execute clean in case of windows to avoid more than
+	// 9 domain entry in a single line
+	if runtime.GOOS == "windows" {
+		h.File.Clean()
+	}
 	return h.File.Flush()
 }