Change logging for missing libraryManifest to verbose

With regards to backward compatibility the libraryManifest
can be missing.
When --all is omitted the libraryManifest can also be missing.

Author: tobiasso85

lib/processors/versionInfoGenerator.js

@@ -288,7 +288,7 @@ async function processManifestAndGetArtifactInfo(libraryManifest, name) {
  */
 const processLibraryInfo = async (libraryInfo) => {
 	if (!libraryInfo.libraryManifest) {
-		log.warn(
+		log.verbose(
 			`Cannot add meta information for library '${libraryInfo.name}'. The manifest.json file cannot be found`);
 		return;
 	}

test/lib/processors/versionInfoGenerator.js

@@ -85,8 +85,8 @@ test.serial("versionInfoGenerator simple library infos", async (t) => {
 		]
 	};
 	assertVersionInfoContent(t, oExpected, result);
-	t.is(t.context.warnLogStub.callCount, 1);
-	t.is(t.context.warnLogStub.getCall(0).args[0],
+	t.is(t.context.verboseLogStub.callCount, 1);
+	t.is(t.context.verboseLogStub.getCall(0).args[0],
 		"Cannot add meta information for library 'my.lib'. The manifest.json file cannot be found");
 });
 

test/lib/tasks/generateVersionInfo.js

@@ -146,8 +146,8 @@ test.serial("integration: Library without i18n bundle file", async (t) => {
 		"version": "1.33.7",
 	}, oOptions);
 
-	t.is(t.context.warnLogStub.callCount, 1);
-	t.is(t.context.warnLogStub.getCall(0).args[0],
+	t.is(t.context.verboseLogStub.callCount, 1);
+	t.is(t.context.verboseLogStub.getCall(0).args[0],
 		"Cannot add meta information for library 'test.lib3'. The manifest.json file cannot be found");
 });