[web/test] drop dependency on third party cubes
Drop dependency on cubicweb-file, cubicweb-blog and cubicweb-tag for cubicweb/web/test
Copy required parts of cubes (schema, entities, views and hooks) into
cubicweb/web/test/data/cubicweb-<cube> that make tests pass.
### Requirements for tests in various cubicweb/**/test directories. ###
## shared by several test folders
docutils
Twisted < 16.0.0
webtest
## cubicweb/test
Pygments
mock
#fyzz XXX pip install fails
## cubicweb/devtools/test
flake8
## cubicweb/hooks/test
psycopg2
## cubicweb/pyramid/test
pyramid >= 1.5.0
waitress >= 0.8.9
wsgicors >= 0.3
pyramid_multiauth
repoze.lru
## cubicweb/sobject/test