[REF] Volumes management

[YannickB]

Hello all,

This is the PR for #219. As announced, this is a heavy refactor of the container structure, to remove the data/files/exec we used until now.

-Add new clouder.volume model. The clouder.volume is linked to service but not removed when service is unlink (unless explicit) -Bind/Postfix/Proxy/Postgres/Odoo templates are simplified and don't use data/files/exec anymore -SSH template is now a new application type -Resolve some bug with raise_error having wrong number of argument -Service now know they have to create a container thanks to an explicit checkbox, remove dummy field.

Also I officially drop the support for Odoo 8. You can still deploy Odoo 8 instance with Clouder, but you can't install Clouder module on Odoo 8 anymore. The reason is mainly the use of odoo tag in xml file.

Some image use my yannickburon docker hub repo, until the PR is merged and I can create the new image on official repo.

[codecov-io]

Codecov Report

Merging #220 into master will increase coverage by 0.24%. The diff coverage is 27.55%.

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   32.92%   33.17%   +0.24%     
==========================================
  Files          50       52       +2     
  Lines        3836     3901      +65     
==========================================
+ Hits         1263     1294      +31     
- Misses       2573     2607      +34

Impacted Files	Coverage Δ
clouder/models/service_link.py	58.53% <ø> (+3.99%)	:arrow_up:
clouder/models/base_metadata.py	41.66% <ø> (ø)	:arrow_up:
clouder/models/service_metadata.py	41.66% <ø> (ø)	:arrow_up:
clouder/models/base_option.py	83.33% <ø> (ø)	:arrow_up:
clouder/models/base.py	23.09% <ø> (ø)	:arrow_up:
clouder/models/base_link.py	57.14% <ø> (ø)	:arrow_up:
clouder/models/service_option.py	85.71% <ø> (ø)	:arrow_up:
clouder/models/image.py	42.1% <0%> (ø)	:arrow_up:
clouder/models/template_one_2_many.py	30.3% <0%> (-0.95%)	:arrow_down:
clouder/models/model.py	22.61% <0%> (-0.11%)	:arrow_down:
... and 11 more

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[lasley]

@tedsalmon please review

[YannickB]

Thanks @lasley ! Ready for review