[cwconfig] Retrieve real path of cubes directory
Since logilab-common 1.3.0, we have real path expansion
modutils.modpath_from_file. But the extrapath parameter that is passed from
cubicweb.schema reader may still have symlinks, so expand them here to
hopefully have consistent comparison in modpath_from_file.
### Requirements for tests in various cubicweb/**/test directories. ###
## shared by several test folders
cubicweb-card
docutils
Twisted < 16.0.0
webtest
## cubicweb/test
Pygments
mock
#fyzz XXX pip install fails
cubicweb-file
cubicweb-localperms
cubicweb-tag
## cubicweb/devtools/test
flake8
## cubicweb/hooks/test
psycopg2
## cubicweb/pyramid/test
pyramid >= 1.5.0
waitress >= 0.8.9
wsgicors >= 0.3
pyramid_multiauth
## cubicweb/sobject/test
cubicweb-comment