lib: Pass Python scripts via "-c" instead of stdin
lib: Pass Python scripts via "-c" instead of stdin

This frees up stdin for use by the actual program.

Also, this fixes quoting of $@ to allow spaces in the arguments.

mvollmer/cockpit,mvollmer/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit