If a type explorer depends on a command that will be generated by another type,
the operation fails, as can be seen below.

This may be a corner case, but is hapenning with __package_pip and
__python_virtualenv.

[19:10] brief:cdist% ./bin/cdist config -v loch
INFO: loch: Running global explorers
INFO: loch: Running initial manifest /home/users/nico/privat/firmen/local.ch/vcs/cdist/conf/manifest
INFO: loch: Running object manifests and type explorers
INFO: loch: Running manifest and explorers for __git/root/shinken
INFO: loch: Running manifest and explorers for __package_pip/pyro
/var/lib/cdist/conf/type/__package_pip/explorer/state: line 38: /root/shinken_virtualenv/bin/pip: No such file or directory
INFO: loch: Running manifest and explorers for __python_virtualenv/root/shinken_virtualenv
INFO: loch: Running manifest and explorers for __directory/pyro
INFO: loch: Running manifest and explorers for __directory/root/shinken
INFO: loch: Running manifest and explorers for __directory/root/shinken_virtualenv
INFO: loch: Running manifest and explorers for __package/git
INFO: loch: Running manifest and explorers for __package/python-virtualenv
INFO: loch: Running manifest and explorers for __package_pacman/git
INFO: loch: Running manifest and explorers for __package_pacman/python-virtualenv
INFO: loch: Generating and executing code
INFO: loch: Generating and executing code for __package_pacman/git
INFO: loch: Generating and executing code for __package/git
INFO: loch: Generating and executing code for __directory/root/shinken
INFO: loch: Generating and executing code for __git/root/shinken
fatal: write error: No space left on device
fatal: index-pack failed
ERROR: loch: Code that raised the error:
git clone --quiet "git://github.com/naparuba/shinken.git" "/root/shinken"

ERROR: Remote script execution failed: ssh -o User=root -q loch /bin/sh -e /var/lib/cdist/object/__git/root/shinken/.cdist/code-remote
WARNING: Failed to deploy to the following hosts: loch
INFO: Total processing time for 1 host(s): 340.62370681762695
[19:17] brief:cdist% ./bin/cdist config -v loch

