Vcs: Dissolve VcsManager::registerVersionControl

It's a somewhat unusual pattern, spelling it out will help
to move the vcs plugins setup closer to the now-usual pattern.

Change-Id: Ie7b70e52d75e34cd36b6a1d55ca868e3edab44a7
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/bazaar/bazaarplugin.cpp

@@ -151,7 +151,9 @@ bool BazaarPlugin::initialize(const QStringList &arguments, QString *errorMessag
     Context context(Constants::BAZAAR_CONTEXT);
 
     m_client = new BazaarClient;
-    auto vcsCtrl = initializeVcs<BazaarControl>(context, m_client);
+    auto vcsCtrl = new BazaarControl(m_client);
+    initializeVcs(vcsCtrl, context);
+
     connect(m_client, &VcsBaseClient::changed, vcsCtrl, &BazaarControl::changed);
 
     new OptionsPage(vcsCtrl, this);