Use internal namespace in VCSBase more consistently

Change-Id: I61de9796aaeb9484b44029c5f1d46e69834a04c3
Reviewed-by: Hugues Delorme <delorme.hugues@fougsys.fr>

src/plugins/vcsbase/commonvcssettings.h

@@ -44,8 +44,9 @@ namespace VCSBase {
 namespace Internal {
 
 // Common VCS settings, message check script and user nick names.
-struct CommonVcsSettings
+class CommonVcsSettings
 {
+public:
     CommonVcsSettings();
 
     QString nickNameMailMap;