Use log module to determine current log level

As part of config refactoring process, it makes sense to
remove Debug field of AirshipCTLSettings and use log module
method as source of truth about current log level.

Change-Id: I42e3a9fd3b4e2778c71278f98a0d168421dfd2fb
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>
Relates-To: #327

pkg/bootstrap/isogen/command.go

@@ -71,7 +71,7 @@ func GenerateBootstrapIso(settings *environment.AirshipCTLSettings) error {
 		return err
 	}
 
-	err = generateBootstrapIso(docBundle, builder, cfg, settings.Debug)
+	err = generateBootstrapIso(docBundle, builder, cfg, log.DebugEnabled())
 	if err != nil {
 		return err
 	}

pkg/clusterctl/client/executor.go

@@ -61,7 +61,7 @@ func NewExecutor(cfg ifc.ExecutorConfig) (ifc.Executor, error) {
 	if err != nil {
 		return nil, err
 	}
-	client, err := NewClient(tgtPath, cfg.AirshipSettings.Debug, options)
+	client, err := NewClient(tgtPath, log.DebugEnabled(), options)
 	if err != nil {
 		return nil, err
 	}

pkg/clusterctl/cmd/command.go

@@ -20,6 +20,7 @@ import (
 	"opendev.org/airship/airshipctl/pkg/config"
 	"opendev.org/airship/airshipctl/pkg/document"
 	"opendev.org/airship/airshipctl/pkg/environment"
+	"opendev.org/airship/airshipctl/pkg/log"
 )
 
 // Command adds a layer to clusterctl interface with airshipctl context
@@ -48,7 +49,7 @@ func NewCommand(rs *environment.AirshipCTLSettings) (*Command, error) {
 	if err != nil {
 		return nil, err
 	}
-	client, err := client.NewClient(root, rs.Debug, options)
+	client, err := client.NewClient(root, log.DebugEnabled(), options)
 	if err != nil {
 		return nil, err
 	}

pkg/log/log.go

@@ -31,6 +31,11 @@ func Init(debugFlag bool, out io.Writer) {
 	airshipLog.SetOutput(out)
 }
 
+// DebugEnabled returns whether the debug level is set
+func DebugEnabled() bool {
+	return debug
+}
+
 // Debug is a wrapper for log.Debug
 func Debug(v ...interface{}) {
 	if debug {

pkg/phase/phase.go

@@ -175,7 +175,7 @@ func (p *Cmd) Exec(name string) error {
 			return
 		}
 		executor.Run(runCh, ifc.RunOptions{
-			Debug:  p.Debug,
+			Debug:  log.DebugEnabled(),
 			DryRun: p.DryRun,
 		})
 	}()