Allow starting a container with an existing hostConfig which contains links

Signed-off-by: Antonio Murdaca <runcom@linux.com>

parsers/parsers.go

@@ -3,6 +3,7 @@ package parsers
 import (
 	"fmt"
 	"net/url"
+	"path"
 	"runtime"
 	"strconv"
 	"strings"
@@ -158,5 +159,12 @@ func ParseLink(val string) (string, string, error) {
 	if len(arr) == 1 {
 		return val, val, nil
 	}
+	// This is kept because we can actually get an HostConfig with links
+	// from an already created container and the format is not `foo:bar`
+	// but `/foo:/c1/bar`
+	if strings.HasPrefix(arr[0], "/") {
+		_, alias := path.Split(arr[1])
+		return arr[0][1:], alias, nil
+	}
 	return arr[0], arr[1], nil
 }