[Libvir] [PATCH] add global --readonly flag to virsh

[Richard W.M. Jones]

The current vshInit function in virsh tries some dodgy heuristics to see 
if it should connect readonly or read/write to the hypervisor. 
Unfortunately these heuristics fail, eg. when you have a root-owned 
system-wide qemud, and a user trying to run virsh as non-root.

This patch removes the heuristics and replaces them with a simple -r | 
--readonly flag on the command line.  If omitted, we try to connect 
read/write, otherwise we try to connect readonly.

Note that this doesn't affect the "connect" command in the shell, which 
still has its own --readonly flag that is completely separate from this 
new global flag.

Rich.
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