add "1Sec" to queryable timeframe list

[dakimura]

I just added "1Sec" timeframe to the queryable timeframe list... and confirmed that "1Sec" timeframe is working now

cli = pymkts.Client()
data = [
        np.array([(pd.Timestamp('2019-03-07 00:00:00').value / 10**9, 1, 2, 0)],dtype=[('Epoch', 'i8'), ('Bid', 'f4'), ('Ask', 'f4'), ('Nanoseconds', 'i4')]),
        np.array([(pd.Timestamp('2019-03-07 00:00:00').value / 10**9, 3, 4, 1)],dtype=[('Epoch', 'i8'), ('Bid', 'f4'), ('Ask', 'f4'), ('Nanoseconds', 'i4')]),
        np.array([(pd.Timestamp('2019-03-07 00:00:00').value / 10**9, 5, 6, 2)],dtype=[('Epoch', 'i8'), ('Bid', 'f4'), ('Ask', 'f4'), ('Nanoseconds', 'i4')]),
        np.array([(pd.Timestamp('2019-03-07 00:00:00').value / 10**9, 7, 8, 3)],dtype=[('Epoch', 'i8'), ('Bid', 'f4'), ('Ask', 'f4'), ('Nanoseconds', 'i4')]),
]
for record in data:
        print( cli.write(record, "TEST/1Sec/TICK", isvariablelength=True) )

↓
show command

» \show TEST/1Sec/TICK 1970-01-01
=============================  ==========  ==========  ==========  
                        Epoch  Bid         Ask         Nanoseconds  
=============================  ==========  ==========  ==========  
2019-03-07 00:00:00 +0000 UTC    1           2           0           
2019-03-07 00:00:00 +0000 UTC    3           4           1           
2019-03-07 00:00:00 +0000 UTC    5           6           2           
2019-03-07 00:00:00 +0000 UTC    7           8           3           
=============================  ==========  ==========  ========== 

query using pymkts

>>> reply = cli.query( pymkts.Params('TEST', '1Sec', 'TICK', limit=10) )
>>> print( reply.first().df() )

                           Bid  Ask  Nanoseconds
Epoch
2019-03-07 00:00:00+00:00  1.0  2.0            0
2019-03-07 00:00:00+00:00  3.0  4.0            1
2019-03-07 00:00:00+00:00  5.0  6.0            2
2019-03-07 00:00:00+00:00  7.0  8.0            3

[dakimura]

Before this pull request, integration test was being run to the latest marketstore image that was already pushed.
In order to run the integration test to the code written in the pull request, we need to create docker image of marketstore every time a pull request is created

[dakimura]

Because I added the rounding to minimize the cancellation error of Nanoseconds,
( https://github.com/alpacahq/marketstore/pull/201/files#diff-c387d7519eb758ef8432f6eba7f1e99dR52 )
I needed to change the expected nanosecond values of existing test for CSV import

[gamella]

@umitanuki @Notargets not urgent, but we want to use 1Sec time bucket in our next project. Can you review this PR?