[PATCH 0/3] Experimental support for DTrace probes

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This patchset provides the infrastructure for supporting dynamic
probing of libvirtd, using static DTrace markers. This can be
used by SystemTAP on Linux, or DTrace on Solaris/OS-X/BSD for
low overhead tracing.

The proof of concept provides a handful of markers wrt to network
client connections, security & auth. Obviously it can be expanded
to cover a huge area of our codebase for different tasks. The
hard bit is deciding what should be exposed as a probe point. 
Ideally probes should not be changed/removed once added, since
this would break any user tracing scripts. So a little care needs
to be taken in placing probes to be robust against future code
re-factoring.

Daniel

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