[devtools] Fix database creation issues for CubicWebTestTC tests To reproduce (with a purged repo): * python web/test/test_jscript.py * python web/test/unittest_views_xmlrss.py The '__default_empty_db__' will contain the wrong 'base_url' configuration, thus breaking URLs in the xmlrss tests. Closes #9297611.

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−usr/bin/cubicweb-ctl usr/bin/
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−usr/lib/python2*/*-packages/cubicweb/cwctl.py
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−../cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl