[libvirt] [PATCH] dots should be valid characters in interface names

[Charles Duffy]

Howdy!

I spent some time scratching my head this evening, as libvirt was 
stripping the target/@dev entry from my interface[@type='ethernet'].

Turns out that this was caused by the interface name containing a 
period, which is rejected by isValidIfname(). As the kernel allows the 
creation of such interfaces, it is improper for libvirt to reject them.

The attached one-liner (built against RHEL6b1's libvirt but still 
applicable against current master as of 10c681622) fixes this issue.
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