If installer can't run post_install do not give up (#912)

* Changed core install message

* Removed useless condition (letfover)

* Convert errors running post_install into warnings

Author: cmaglie

commands/core/install.go

@@ -142,13 +142,13 @@ func installPlatform(pm *packagemanager.PackageManager,
 	// Perform post install
 	if !skipPostInstall {
 		log.Info("Running post_install script")
-		taskCB(&rpc.TaskProgress{Message: "Configuring platform (post_install run)"})
+		taskCB(&rpc.TaskProgress{Message: "Configuring platform"})
 		if err := pm.RunPostInstallScript(platformRelease); err != nil {
-			return errors.Errorf("running post install: %s", err)
+			taskCB(&rpc.TaskProgress{Message: fmt.Sprintf("WARNING: cannot run post install: %s", err)})
 		}
-	} else if skipPostInstall {
+	} else {
 		log.Info("Skipping platform configuration (post_install run).")
-		taskCB(&rpc.TaskProgress{Message: "Skipping platform configuration (post_install run)"})
+		taskCB(&rpc.TaskProgress{Message: "Skipping platform configuration"})
 	}
 
 	log.Info("Platform installed")