Feature/odooupgrade service

[blaggacao]

Add Odoo upgrade service:

Todos:

• [x] Download with sftp, too
• [ ] Fix version py27 issues? F*** py27
• [x] Better cursor management
• [x] Resume download or upload
• [ ] Persist stage completion during migration (pre, odoo reconcile, remove, post)

[codecov-io]

Codecov Report

Merging #4 into master will decrease coverage by 12.79%. The diff coverage is 37.33%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   55.96%   43.16%   -12.8%     
==========================================
  Files          17       23       +6     
  Lines         604     1068     +464     
  Branches       84      134      +50     
==========================================
+ Hits          338      461     +123     
- Misses        238      577     +339     
- Partials       28       30       +2

Impacted Files	Coverage Δ
dodoo_migrator/migration/exceptions.py	44.44% <ø> (ø)	:arrow_up:
dodoo_migrator/migration/upgradeservice/errors.py	100% <100%> (ø)
dodoo_migrator/migration/database.py	94.87% <100%> (-5.13%)	:arrow_down:
...odoo_migrator/migration/upgradeservice/__init__.py	100% <100%> (ø)
...igrator/migration/upgradeservice/merge_copytree.py	14.81% <14.81%> (ø)
dodoo_migrator/migration/upgradeservice/db.py	21.02% <21.02%> (ø)
..._migrator/migration/upgradeservice/odoo_service.py	26.82% <26.82%> (ø)
dodoo_migrator/migration/upgradeservice/keys.py	50% <50%> (ø)
dodoo_migrator/migration/migration.py	75.87% <76.92%> (-7.86%)	:arrow_down:
dodoo_migrator/cli.py	88.4% <82.14%> (+7.45%)	:arrow_up:
... and 8 more

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