MAINT: Speed up normalize_axis_tuple by about 30%

This is used in `np.moveaxis`, which is relatively slow.
Timings change as follows:
```
import numpy as np
from numpy.core.numeric import normalize_axis_tuple
%timeit normalize_axis_tuple([0, 1, 2], 4, 'parrot')
a = np.zeros((10,20,30))
%timeit np.moveaxis(a, [0,1,2], [2,1,0])
100000 loops, best of 3: 5.56 µs per loop -> 4.17 µs
```

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