core: Remove IsVdsWithSameNameExist

IsVdsWithSameNameExistQuery is not used anywhere in
the code, and hence should be removed.

This patch removes the following:
1. The IsVdsWithSameNameExistQuery class
2. The IsVdsWithSameNameExist constant representing
   it in VdcQueryType
3. The IsVdsWithSameNameExistParameters class which
   was only used by the removed query class.
3. The getByVdsName(String) method in VdsStaticDAO
   (which was only used by the query), its implementation, and its
   test.
4. The GetVdsStaticByVdsNam stored procedure
   that was only used by the said DAO function.

Change-Id: I676cca49a2cc62c7b0716589ee26d2bcffd3cbb7
Signed-off-by: Allon Mureinik <amureini@redhat.com>