Rename LDAP to LDAPNoTLS
This is a precursor to https://gitlab.com/gitlab-org/gitlab-qa/merge_requests/194. This is needed because name changes in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22574 would cause existing LDAP tests to be ignored. See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22574#note_111907053