[cwctl] fix cubicweb-ctl shell command (closes #2583919) * add an uri parsing utility that documents a bit the uri cubicweb supports out of the box * cwctl: use this utility and refactor a bit for clarity (the novelty here being real support for old style 'myapp', or: * 'inmemory://myapp' * 'pyro://pyro-ns-host:pyro-ns-port/myapp' (pyro access through a pyro concentrator) * 'pyroloc://host:port/pyro-instance-id' (direct access to a pyro repository) * 'zmqpickle-tcp://host:port' * dbapi: refactor to sort out some of the complexity and restore functionality lost in 62213a34726e

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debian/tmp/usr/bin/cubicweb-ctl usr/bin/

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debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/cwctl.py usr/lib/PY_VERSION/site-packages/cubicweb

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debian/cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl