fix full and full_like when input is boolean

[Alicia1529]

Description

1. enable np.full to accept Boolean values as fill_value

>>> from mxnet import np
>>> np.full((3,3), True)
array([[ True,  True,  True],
       [ True,  True,  True],
       [ True,  True,  True]])
>>> np.full((3,3), False, dtype=np.int32)
array([[0, 0, 0],
       [0, 0, 0],
       [0, 0, 0]], dtype=int32)

2. enable np.full_like to accept 'np.bool' as dtype and boolean values as 'fill_value'

>>> a = np.arange(9).reshape(3,3)
>>> np.full_like(a, 1, dtype=np.bool)
array([[ True,  True,  True],
       [ True,  True,  True],
       [ True,  True,  True]])
>>> np.full_like(a, False)
array([[0., 0., 0.],
       [0., 0., 0.],
       [0., 0., 0.]])

[haojin2]

LGTM