Core: Remove unused functionality to checkout from VCS

Change-Id: I1ee17142e14200c5ae9597bbf9bee3f3978704f4
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cvs/cvscontrol.cpp

@@ -74,7 +74,6 @@ bool CvsControl::supportsOperation(Operation operation) const
     case MoveOperation:
     case CreateRepositoryOperation:
     case SnapshotOperations:
-    case CheckoutOperation:
     case GetRepositoryRootOperation:
         rc = false;
         break;
@@ -123,11 +122,6 @@ QString CvsControl::vcsGetRepositoryURL(const QString &)
     return QString();
 }
 
-bool CvsControl::vcsCheckout(const QString &, const QByteArray &)
-{
-    return false;
-}
-
 bool CvsControl::vcsAnnotate(const QString &file, int line)
 {
     const QFileInfo fi(file);