BUG: linspace behavior for date_range is incorrect when tz aware
#### Code Sample, a copy-pastable example if possible

xref #20846

```python
In [2]: dti = pd.date_range('20180101', '20180103', periods=3, tz='US/Eastern')

In [3]: dti
Out[3]: DatetimeIndex(['2017-12-31', '2018-01-01', '2018-01-02'], dtype='datetime64[ns, US/Eastern]', freq=None)

In [4]: dti[0]
Out[4]: Timestamp('2017-12-31 19:00:00-0500', tz='US/Eastern')
```
#### Problem description
The dates in the `date_range` are not being localized correctly; the dates are being shifted back by the UTC offset, then having the timezone appended to the shifted back date.

#### Expected Output
I'd expect this to be identical to the equivalent non-linspace behavior call:
```python
In [5]: dti2 = pd.date_range('20180101', periods=3, freq='D', tz='US/Eastern')

In [6]: dti2
Out[6]:
DatetimeIndex(['2018-01-01 00:00:00-05:00', '2018-01-02 00:00:00-05:00',
               '2018-01-03 00:00:00-05:00'],
              dtype='datetime64[ns, US/Eastern]', freq='D')

In [7]: dti2[0]
Out[7]: Timestamp('2018-01-01 00:00:00-0500', tz='US/Eastern', freq='D')
```

#### Output of ``pd.show_versions()``

<details>

INSTALLED VERSIONS
------------------
commit: b3f07b2551b7eb40408ca28416ca5e21f8fb37b4
python: 3.6.1.final.0
python-bits: 64
OS: Windows
OS-release: 10
machine: AMD64
processor: Intel64 Family 6 Model 78 Stepping 3, GenuineIntel
byteorder: little
LC_ALL: None
LANG: None
LOCALE: None.None

pandas: 0.23.0rc2+23.gb3f07b2
pytest: 3.1.2
pip: 9.0.1
setuptools: 39.0.1
Cython: 0.28.2
numpy: 1.13.3
scipy: 1.0.0
pyarrow: 0.6.0
xarray: 0.9.6
IPython: 6.1.0
sphinx: 1.5.6
patsy: 0.4.1
dateutil: 2.6.0
pytz: 2017.2
blosc: None
bottleneck: 1.2.1
tables: 3.4.2
numexpr: 2.6.4
feather: 0.4.0
matplotlib: 2.0.2
openpyxl: 2.4.8
xlrd: 1.1.0
xlwt: 1.3.0
xlsxwriter: 0.9.8
lxml: 3.8.0
bs4: None
html5lib: 0.999
sqlalchemy: 1.1.13
pymysql: None
psycopg2: None
jinja2: 2.9.6
s3fs: None
fastparquet: 0.1.5
pandas_gbq: None
pandas_datareader: None

</details>
