[libvirt] PATCH: 0/5: Enhancing the virExec function

["Daniel P. Berrange" <berrange redhat com>]

The following series of patches do a bunch of work on the virExec function.
Overall this leads to a more robust implementation with better error
reporting, and an increased level functionality. This lets us remove all
uses of fork/exec in libvirt and replace them with virExec. This was all
motivated by some fork/exec bugs discovered when refactoring LXC driver
which have potential to affect every use of fork/exec in our code.

Daniel
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