add ctest for drotm and modified ctest for drot.

        make sure that test cases cover all code path when kernel uses looping unrolling.

Author: shengyang-3390

ctest/c_dblas1.c

@@ -53,6 +53,13 @@ void F77_drot( const int *N, double *X, const int *incX, double *Y,
    return;
 }
 
+void F77_drotm(const int *N, double *X, const int *incX, double *Y,
+               const int *incY, const double *dparam)
+{
+   cblas_drotm(*N, X, *incX, Y, *incY, dparam);
+   return;
+}
+
 void F77_dscal(const int *N, const double *alpha, double *X,
                          const int *incX)
 {