preflight: Move network related var/const to appropriate file

This uses this code movement as an opportunity to rework how the
paths/filenames are generated, `/etc/NetworkManager/` can be shared
between the dnsmasq and NM configuration paths, and the name of the
files is only used once, so it does not need to be a separate constant.

pkg/crc/preflight/preflight_checks_linux.go

@@ -24,23 +24,10 @@ import (
 )
 
 const (
-	crcDnsmasqConfigFile        = "crc.conf"
-	crcNetworkManagerConfigFile = "crc-nm-dnsmasq.conf"
 	// This is defined in https://github.com/code-ready/machine-driver-libvirt/blob/master/go.mod#L5
 	minSupportedLibvirtVersion = "3.4.0"
 )
 
-var (
-	crcDnsmasqConfigPath = filepath.Join(string(filepath.Separator), "etc", "NetworkManager", "dnsmasq.d", crcDnsmasqConfigFile)
-	crcDnsmasqConfig     = `server=/apps-crc.testing/192.168.130.11
-server=/crc.testing/192.168.130.11
-`
-	crcNetworkManagerConfigPath = filepath.Join(string(filepath.Separator), "etc", "NetworkManager", "conf.d", crcNetworkManagerConfigFile)
-	crcNetworkManagerConfig     = `[main]
-dns=dnsmasq
-`
-)
-
 func checkVirtualizationEnabled() error {
 	logging.Debug("Checking if the vmx/svm flags are present in /proc/cpuinfo")
 	// Check if the cpu flags vmx or svm is present

pkg/crc/preflight/preflight_checks_network_linux.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"path/filepath"
 
 	"github.com/code-ready/crc/pkg/crc/logging"
 	"github.com/code-ready/crc/pkg/crc/systemd"
@@ -51,6 +52,20 @@ var dnsmasqPreflightChecks = [...]Check{
 	},
 }
 
+var (
+	crcNetworkManagerRootPath = filepath.Join(string(filepath.Separator), "etc", "NetworkManager")
+
+	crcDnsmasqConfigPath = filepath.Join(crcNetworkManagerRootPath, "dnsmasq.d", "crc.conf")
+	crcDnsmasqConfig     = `server=/apps-crc.testing/192.168.130.11
+server=/crc.testing/192.168.130.11
+`
+
+	crcNetworkManagerConfigPath = filepath.Join(crcNetworkManagerRootPath, "conf.d", "crc-nm-dnsmasq.conf")
+	crcNetworkManagerConfig     = `[main]
+dns=dnsmasq
+`
+)
+
 func fixNetworkManagerConfigFile(path string, content string, perms os.FileMode) error {
 	err := crcos.WriteToFileAsRoot(
 		fmt.Sprintf("write NetworkManager configuration to %s", path),