[FIX] carepoint: Fix sequence generation

[lasley]

• Call execute directly on connection to allow params

Before:

>>> cp = Carepoint(
...     server='10.0.13.73',
...     user='test_odoo',
...     passwd='',
... )
>>> cp.get_next_sequence('pat_id')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "carepoint/db/carepoint.py", line 338, in get_next_sequence
    seq_name=sequence_name,
  File "/root/_venv/local/lib/python2.7/site-packages/sqlalchemy/orm/session.py", line 1104, in execute
    bind = self.get_bind(mapper, clause=clause, **kw)
TypeError: get_bind() got an unexpected keyword argument 'seq_name'

After:

>>> cp = Carepoint(
...     server='10.0.13.73',
...     user='test_odoo',
...     passwd='',
... )
>>> cp.get_next_sequence('pat_id')
1103

[codecov-io]

Current coverage is 97.63% (diff: 100%)

Merging #21 into release/0.1 will not change coverage

@@           release/0.1        #21   diff @@
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  Partials            18         18          

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[tedsalmon]

👍 LGTM :)