make pkg/parsers support darwin and solaris

Signed-off-by: allencloud <allen.sun@daocloud.io>

parsers/kernel/kernel.go

@@ -5,7 +5,6 @@
 package kernel
 
 import (
-	"bytes"
 	"errors"
 	"fmt"
 )
@@ -46,31 +45,6 @@ func CompareKernelVersion(a, b VersionInfo) int {
 	return 0
 }
 
-// GetKernelVersion gets the current kernel version.
-func GetKernelVersion() (*VersionInfo, error) {
-	var (
-		err error
-	)
-
-	uts, err := uname()
-	if err != nil {
-		return nil, err
-	}
-
-	release := make([]byte, len(uts.Release))
-
-	i := 0
-	for _, c := range uts.Release {
-		release[i] = byte(c)
-		i++
-	}
-
-	// Remove the \x00 from the release for Atoi to parse correctly
-	release = release[:bytes.IndexByte(release, 0)]
-
-	return ParseRelease(string(release))
-}
-
 // ParseRelease parses a string and creates a VersionInfo based on it.
 func ParseRelease(release string) (*VersionInfo, error) {
 	var (