Updates specfile to match distro guidelines. Suppots modifying client directory path at build time.

- Support relocating client files at build time (required for LSB compliant nodes)
- OS varable added to perform some make choices
- Saving and exporting the Makefile vars now scripted using list of variables
- Updated specfile to match RH and SUSE requirements and guidelines
- Moved /usr/local/var to /var/local; dynamic files shall not use /usr.
- State files use %sharedstatedir for path (std for SLE and RHEL)
- Release value adjusted to meet different DEB and RPM reqs.

Signed-off-by: jcsiadal <jeremy.c.siadal@intel.com>

internal/app/wwclient/root.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"os/exec"
 	"os/signal"
+	"path"
 	"strings"
 	"syscall"
 	"time"
@@ -62,7 +63,10 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 		return errors.New("found pidfile " + PIDFile + " not starting")
 	}
 
-	if os.Args[0] == buildconfig.WWCLIENTLOC() {
+	clientDir := buildconfig.WWCLIENTDIR()
+	testDir := path.Join(clientDir, "wwclient-test")
+
+	if os.Args[0] == path.Join(clientDir, "wwclient") {
 		err := os.Chdir("/")
 		if err != nil {
 			wwlog.Printf(wwlog.ERROR, "failed to change dir: %s", err)
@@ -73,15 +77,15 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 		time.Sleep(5000 * time.Millisecond)
 	} else {
 		fmt.Printf("Called via: %s\n", os.Args[0])
-		fmt.Printf("Runtime overlay is being put in '/warewulf/wwclient-test' rather than '/'\n")
-		err := os.MkdirAll("/warewulf/wwclient-test", 0755)
+		fmt.Printf("Runtime overlay is being put in '%s' rather than '/'\n", testDir)
+		err := os.MkdirAll(testDir, 0755)
 		if err != nil {
 			wwlog.Printf(wwlog.ERROR, "failed to create dir: %s", err)
 			_ = os.Remove(PIDFile)
 			os.Exit(1)
 		}
 
-		err = os.Chdir("/warewulf/wwclient-test")
+		err = os.Chdir(testDir)
 		if err != nil {
 			wwlog.Printf(wwlog.ERROR, "failed to change dir: %s", err)
 			_ = os.Remove(PIDFile)